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Date:: Sun Jan 23 22:14:22 2022 UTC
Message:: add missing error check in got_inflate_to_mem_mmap()
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1 /*
2  * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 
18 #include <errno.h>
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <string.h>
22 #include <unistd.h>
23 #include <zlib.h>
24 #include <time.h>
25 
26 #include "got_error.h"
27 #include "got_object.h"
28 #include "got_path.h"
29 
30 #include "got_lib_inflate.h"
31 
32 #ifndef MIN
33 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
34 #endif
35 
36 const struct got_error *
37 got_inflate_init(struct got_inflate_buf *zb, uint8_t *outbuf, size_t bufsize,
38     struct got_inflate_checksum *csum)
39 {
40 	const struct got_error *err = NULL;
41 	int zerr;
42 
43 	memset(&zb->z, 0, sizeof(zb->z));
44 
45 	zb->z.zalloc = Z_NULL;
46 	zb->z.zfree = Z_NULL;
47 	zerr = inflateInit(&zb->z);
48 	if (zerr != Z_OK) {
49 		if  (zerr == Z_ERRNO)
50 			return got_error_from_errno("inflateInit");
51 		if  (zerr == Z_MEM_ERROR) {
52 			errno = ENOMEM;
53 			return got_error_from_errno("inflateInit");
54 		}
55 		return got_error(GOT_ERR_DECOMPRESSION);
56 	}
57 
58 	zb->inlen = zb->outlen = bufsize;
59 
60 	zb->inbuf = calloc(1, zb->inlen);
61 	if (zb->inbuf == NULL) {
62 		err = got_error_from_errno("calloc");
63 		goto done;
64 	}
65 
66 	zb->flags = 0;
67 	if (outbuf == NULL) {
68 		zb->outbuf = calloc(1, zb->outlen);
69 		if (zb->outbuf == NULL) {
70 			err = got_error_from_errno("calloc");
71 			goto done;
72 		}
73 		zb->flags |= GOT_INFLATE_F_OWN_OUTBUF;
74 	} else
75 		zb->outbuf = outbuf;
76 
77 	zb->csum = csum;
78 done:
79 	if (err)
80 		got_inflate_end(zb);
81 	return err;
82 }
83 
84 static void
85 csum_input(struct got_inflate_checksum *csum, const uint8_t *buf, size_t len)
86 {
87 	if (csum->input_crc)
88 		*csum->input_crc = crc32(*csum->input_crc, buf, len);
89 
90 	if (csum->input_sha1)
91 		SHA1Update(csum->input_sha1, buf, len);
92 }
93 
94 static void
95 csum_output(struct got_inflate_checksum *csum, const uint8_t *buf, size_t len)
96 {
97 	if (csum->output_crc)
98 		*csum->output_crc = crc32(*csum->output_crc, buf, len);
99 
100 	if (csum->output_sha1)
101 		SHA1Update(csum->output_sha1, buf, len);
102 }
103 
104 const struct got_error *
105 got_inflate_read(struct got_inflate_buf *zb, FILE *f, size_t *outlenp,
106     size_t *consumed)
107 {
108 	size_t last_total_out = zb->z.total_out;
109 	size_t last_total_in = zb->z.total_in;
110 	z_stream *z = &zb->z;
111 	int ret = Z_ERRNO;
112 
113 	z->next_out = zb->outbuf;
114 	z->avail_out = zb->outlen;
115 
116 	*outlenp = 0;
117 	if (consumed)
118 		*consumed = 0;
119 	do {
120 		uint8_t *csum_in = NULL, *csum_out = NULL;
121 		size_t csum_avail_in = 0, csum_avail_out = 0;
122 
123 		if (z->avail_in == 0) {
124 			size_t n = fread(zb->inbuf, 1, zb->inlen, f);
125 			if (n == 0) {
126 				if (ferror(f))
127 					return got_ferror(f, GOT_ERR_IO);
128 				/* EOF */
129 				ret = Z_STREAM_END;
130 				break;
131 			}
132 			z->next_in = zb->inbuf;
133 			z->avail_in = n;
134 		}
135 		if (zb->csum) {
136 			csum_in = z->next_in;
137 			csum_avail_in = z->avail_in;
138 			csum_out = z->next_out;
139 			csum_avail_out = z->avail_out;
140 		}
141 		ret = inflate(z, Z_SYNC_FLUSH);
142 		if (zb->csum) {
143 			csum_input(zb->csum, csum_in,
144 			    csum_avail_in - z->avail_in);
145 			csum_output(zb->csum, csum_out,
146 			    csum_avail_out - z->avail_out);
147 		}
148 	} while (ret == Z_OK && z->avail_out > 0);
149 
150 	if (ret == Z_OK || ret == Z_BUF_ERROR) {
151 		zb->flags |= GOT_INFLATE_F_HAVE_MORE;
152 	} else {
153 		if (ret != Z_STREAM_END)
154 			return got_error(GOT_ERR_DECOMPRESSION);
155 		zb->flags &= ~GOT_INFLATE_F_HAVE_MORE;
156 	}
157 
158 	*outlenp = z->total_out - last_total_out;
159 	if (consumed)
160 		*consumed += z->total_in - last_total_in;
161 	return NULL;
162 }
163 
164 const struct got_error *
165 got_inflate_read_fd(struct got_inflate_buf *zb, int fd, size_t *outlenp,
166     size_t *consumed)
167 {
168 	size_t last_total_out = zb->z.total_out;
169 	size_t last_total_in = zb->z.total_in;
170 	z_stream *z = &zb->z;
171 	int ret = Z_ERRNO;
172 
173 	z->next_out = zb->outbuf;
174 	z->avail_out = zb->outlen;
175 
176 	*outlenp = 0;
177 	if (consumed)
178 		*consumed = 0;
179 	do {
180 		uint8_t *csum_in = NULL, *csum_out = NULL;
181 		size_t csum_avail_in = 0, csum_avail_out = 0;
182 
183 		if (z->avail_in == 0) {
184 			ssize_t n = read(fd, zb->inbuf, zb->inlen);
185 			if (n < 0)
186 				return got_error_from_errno("read");
187 			else if (n == 0) {
188 				/* EOF */
189 				ret = Z_STREAM_END;
190 				break;
191 			}
192 			z->next_in = zb->inbuf;
193 			z->avail_in = n;
194 		}
195 		if (zb->csum) {
196 			csum_in = z->next_in;
197 			csum_avail_in = z->avail_in;
198 			csum_out = z->next_out;
199 			csum_avail_out = z->avail_out;
200 		}
201 		ret = inflate(z, Z_SYNC_FLUSH);
202 		if (zb->csum) {
203 			csum_input(zb->csum, csum_in,
204 			    csum_avail_in - z->avail_in);
205 			csum_output(zb->csum, csum_out,
206 			    csum_avail_out - z->avail_out);
207 		}
208 	} while (ret == Z_OK && z->avail_out > 0);
209 
210 	if (ret == Z_OK || ret == Z_BUF_ERROR) {
211 		zb->flags |= GOT_INFLATE_F_HAVE_MORE;
212 	} else {
213 		if (ret != Z_STREAM_END)
214 			return got_error(GOT_ERR_DECOMPRESSION);
215 		zb->flags &= ~GOT_INFLATE_F_HAVE_MORE;
216 	}
217 
218 	*outlenp = z->total_out - last_total_out;
219 	if (consumed)
220 		*consumed += z->total_in - last_total_in;
221 	return NULL;
222 }
223 
224 const struct got_error *
225 got_inflate_read_mmap(struct got_inflate_buf *zb, uint8_t *map, size_t offset,
226     size_t len, size_t *outlenp, size_t *consumed)
227 {
228 	size_t last_total_out = zb->z.total_out;
229 	z_stream *z = &zb->z;
230 	int ret = Z_ERRNO;
231 
232 	z->next_out = zb->outbuf;
233 	z->avail_out = zb->outlen;
234 
235 	*outlenp = 0;
236 	*consumed = 0;
237 
238 	do {
239 		uint8_t *csum_in = NULL, *csum_out = NULL;
240 		size_t csum_avail_in = 0, csum_avail_out = 0;
241 		size_t last_total_in = zb->z.total_in;
242 
243 		if (z->avail_in == 0) {
244 			if (len == 0) {
245 				/* EOF */
246 				ret = Z_STREAM_END;
247 				break;
248 			}
249 			z->next_in = map + offset + *consumed;
250 			z->avail_in = len - *consumed;
251 		}
252 		if (zb->csum) {
253 			csum_in = z->next_in;
254 			csum_avail_in = z->avail_in;
255 			csum_out = z->next_out;
256 			csum_avail_out = z->avail_out;
257 		}
258 		ret = inflate(z, Z_SYNC_FLUSH);
259 		if (zb->csum) {
260 			csum_input(zb->csum, csum_in,
261 			    csum_avail_in - z->avail_in);
262 			csum_output(zb->csum, csum_out,
263 			    csum_avail_out - z->avail_out);
264 		}
265 		*consumed += z->total_in - last_total_in;
266 	} while (ret == Z_OK && z->avail_out > 0);
267 
268 	if (ret == Z_OK || ret == Z_BUF_ERROR) {
269 		zb->flags |= GOT_INFLATE_F_HAVE_MORE;
270 	} else {
271 		if (ret != Z_STREAM_END)
272 			return got_error(GOT_ERR_DECOMPRESSION);
273 		zb->flags &= ~GOT_INFLATE_F_HAVE_MORE;
274 	}
275 
276 	*outlenp = z->total_out - last_total_out;
277 	return NULL;
278 }
279 
280 void
281 got_inflate_end(struct got_inflate_buf *zb)
282 {
283 	free(zb->inbuf);
284 	if (zb->flags & GOT_INFLATE_F_OWN_OUTBUF)
285 		free(zb->outbuf);
286 	inflateEnd(&zb->z);
287 }
288 
289 const struct got_error *
290 got_inflate_to_mem(uint8_t **outbuf, size_t *outlen,
291     size_t *consumed_total, struct got_inflate_checksum *csum, FILE *f)
292 {
293 	const struct got_error *err;
294 	size_t avail, consumed;
295 	struct got_inflate_buf zb;
296 	void *newbuf;
297 	int nbuf = 1;
298 
299 	if (outbuf) {
300 		*outbuf = malloc(GOT_INFLATE_BUFSIZE);
301 		if (*outbuf == NULL)
302 			return got_error_from_errno("malloc");
303 		err = got_inflate_init(&zb, *outbuf, GOT_INFLATE_BUFSIZE, csum);
304 	} else
305 		err = got_inflate_init(&zb, NULL, GOT_INFLATE_BUFSIZE, csum);
306 	if (err)
307 		return err;
308 
309 	*outlen = 0;
310 	if (consumed_total)
311 		*consumed_total = 0;
312 
313 	do {
314 		err = got_inflate_read(&zb, f, &avail, &consumed);
315 		if (err)
316 			goto done;
317 		*outlen += avail;
318 		if (consumed_total)
319 			*consumed_total += consumed;
320 		if (zb.flags & GOT_INFLATE_F_HAVE_MORE) {
321 			if (outbuf == NULL)
322 				continue;
323 			zb.outlen = (nbuf * GOT_INFLATE_BUFSIZE) - *outlen;
324 			newbuf = reallocarray(*outbuf, ++nbuf,
325 			    GOT_INFLATE_BUFSIZE);
326 			if (newbuf == NULL) {
327 				err = got_error_from_errno("reallocarray");
328 				free(*outbuf);
329 				*outbuf = NULL;
330 				*outlen = 0;
331 				goto done;
332 			}
333 			*outbuf = newbuf;
334 			zb.outbuf = newbuf + *outlen;
335 		}
336 	} while (zb.flags & GOT_INFLATE_F_HAVE_MORE);
337 
338 done:
339 	got_inflate_end(&zb);
340 	return err;
341 }
342 
343 const struct got_error *
344 got_inflate_to_mem_fd(uint8_t **outbuf, size_t *outlen,
345     size_t *consumed_total, struct got_inflate_checksum *csum, 
346     size_t expected_size, int infd)
347 {
348 	const struct got_error *err;
349 	size_t avail, consumed;
350 	struct got_inflate_buf zb;
351 	void *newbuf;
352 	int nbuf = 1;
353 	size_t bufsize = GOT_INFLATE_BUFSIZE;
354 
355 	/* Optimize buffer size in case short reads should suffice. */
356 	if (expected_size > 0 && expected_size < bufsize)
357 		bufsize = expected_size;
358 
359 	if (outbuf) {
360 		*outbuf = malloc(bufsize);
361 		if (*outbuf == NULL)
362 			return got_error_from_errno("malloc");
363 		err = got_inflate_init(&zb, *outbuf, GOT_INFLATE_BUFSIZE, csum);
364 	} else
365 		err = got_inflate_init(&zb, NULL, bufsize, csum);
366 	if (err)
367 		goto done;
368 
369 	*outlen = 0;
370 	if (consumed_total)
371 		*consumed_total = 0;
372 
373 	do {
374 		err = got_inflate_read_fd(&zb, infd, &avail, &consumed);
375 		if (err)
376 			goto done;
377 		*outlen += avail;
378 		if (consumed_total)
379 			*consumed_total += consumed;
380 		if (zb.flags & GOT_INFLATE_F_HAVE_MORE) {
381 			if (outbuf == NULL)
382 				continue;
383 			zb.outlen = (nbuf * GOT_INFLATE_BUFSIZE) - *outlen;
384 			newbuf = reallocarray(*outbuf, ++nbuf,
385 			    GOT_INFLATE_BUFSIZE);
386 			if (newbuf == NULL) {
387 				err = got_error_from_errno("reallocarray");
388 				free(*outbuf);
389 				*outbuf = NULL;
390 				*outlen = 0;
391 				goto done;
392 			}
393 			*outbuf = newbuf;
394 			zb.outbuf = newbuf + *outlen;
395 		}
396 	} while (zb.flags & GOT_INFLATE_F_HAVE_MORE);
397 
398 done:
399 	got_inflate_end(&zb);
400 	return err;
401 }
402 
403 const struct got_error *
404 got_inflate_to_mem_mmap(uint8_t **outbuf, size_t *outlen,
405     size_t *consumed_total, struct got_inflate_checksum *csum, uint8_t *map,
406     size_t offset, size_t len)
407 {
408 	const struct got_error *err;
409 	size_t avail, consumed;
410 	struct got_inflate_buf zb;
411 	void *newbuf;
412 	int nbuf = 1;
413 
414 	if (outbuf) {
415 		*outbuf = malloc(GOT_INFLATE_BUFSIZE);
416 		if (*outbuf == NULL)
417 			return got_error_from_errno("malloc");
418 		err = got_inflate_init(&zb, *outbuf, GOT_INFLATE_BUFSIZE, csum);
419 		if (err) {
420 			free(*outbuf);
421 			*outbuf = NULL;
422 			return err;
423 		}
424 	} else {
425 		err = got_inflate_init(&zb, NULL, GOT_INFLATE_BUFSIZE, csum);
426 		if (err)
427 			return err;
428 	}
429 
430 	*outlen = 0;
431 	if (consumed_total)
432 		*consumed_total = 0;
433 	do {
434 		err = got_inflate_read_mmap(&zb, map, offset, len, &avail,
435 		    &consumed);
436 		if (err)
437 			goto done;
438 		offset += consumed;
439 		if (consumed_total)
440 			*consumed_total += consumed;
441 		len -= consumed;
442 		*outlen += avail;
443 		if (len == 0)
444 			break;
445 		if (zb.flags & GOT_INFLATE_F_HAVE_MORE) {
446 			if (outbuf == NULL)
447 				continue;
448 			newbuf = reallocarray(*outbuf, ++nbuf,
449 			    GOT_INFLATE_BUFSIZE);
450 			if (newbuf == NULL) {
451 				err = got_error_from_errno("reallocarray");
452 				free(*outbuf);
453 				*outbuf = NULL;
454 				*outlen = 0;
455 				goto done;
456 			}
457 			*outbuf = newbuf;
458 			zb.outbuf = newbuf + *outlen;
459 			zb.outlen = (nbuf * GOT_INFLATE_BUFSIZE) - *outlen;
460 		}
461 	} while (zb.flags & GOT_INFLATE_F_HAVE_MORE);
462 done:
463 	got_inflate_end(&zb);
464 	return err;
465 }
466 
467 const struct got_error *
468 got_inflate_to_fd(size_t *outlen, FILE *infile,
469     struct got_inflate_checksum *csum, int outfd)
470 {
471 	const struct got_error *err = NULL;
472 	size_t avail;
473 	struct got_inflate_buf zb;
474 
475 	err = got_inflate_init(&zb, NULL, GOT_INFLATE_BUFSIZE, csum);
476 	if (err)
477 		goto done;
478 
479 	*outlen = 0;
480 
481 	do {
482 		err = got_inflate_read(&zb, infile, &avail, NULL);
483 		if (err)
484 			goto done;
485 		if (avail > 0) {
486 			ssize_t n;
487 			n = write(outfd, zb.outbuf, avail);
488 			if (n != avail) {
489 				err = got_error_from_errno("write");
490 				goto done;
491 			}
492 			*outlen += avail;
493 		}
494 	} while (zb.flags & GOT_INFLATE_F_HAVE_MORE);
495 
496 done:
497 	if (err == NULL) {
498 		if (lseek(outfd, SEEK_SET, 0) == -1)
499 			err = got_error_from_errno("lseek");
500 	}
501 	got_inflate_end(&zb);
502 	return err;
503 }
504 
505 const struct got_error *
506 got_inflate_to_file(size_t *outlen, FILE *infile,
507     struct got_inflate_checksum *csum, FILE *outfile)
508 {
509 	const struct got_error *err;
510 	size_t avail;
511 	struct got_inflate_buf zb;
512 
513 	err = got_inflate_init(&zb, NULL, GOT_INFLATE_BUFSIZE, csum);
514 	if (err)
515 		goto done;
516 
517 	*outlen = 0;
518 
519 	do {
520 		err = got_inflate_read(&zb, infile, &avail, NULL);
521 		if (err)
522 			goto done;
523 		if (avail > 0) {
524 			size_t n;
525 			n = fwrite(zb.outbuf, avail, 1, outfile);
526 			if (n != 1) {
527 				err = got_ferror(outfile, GOT_ERR_IO);
528 				goto done;
529 			}
530 			*outlen += avail;
531 		}
532 	} while (zb.flags & GOT_INFLATE_F_HAVE_MORE);
533 
534 done:
535 	if (err == NULL)
536 		rewind(outfile);
537 	got_inflate_end(&zb);
538 	return err;
539 }
540 
541 const struct got_error *
542 got_inflate_to_file_fd(size_t *outlen, size_t *consumed_total,
543     struct got_inflate_checksum *csum, int infd, FILE *outfile)
544 {
545 	const struct got_error *err;
546 	size_t avail, consumed;
547 	struct got_inflate_buf zb;
548 
549 	err = got_inflate_init(&zb, NULL, GOT_INFLATE_BUFSIZE, csum);
550 	if (err)
551 		goto done;
552 
553 	*outlen = 0;
554 	if (consumed_total)
555 		*consumed_total = 0;
556 	do {
557 		err = got_inflate_read_fd(&zb, infd, &avail, &consumed);
558 		if (err)
559 			goto done;
560 		if (avail > 0) {
561 			size_t n;
562 			n = fwrite(zb.outbuf, avail, 1, outfile);
563 			if (n != 1) {
564 				err = got_ferror(outfile, GOT_ERR_IO);
565 				goto done;
566 			}
567 			*outlen += avail;
568 			if (consumed_total)
569 				*consumed_total += consumed;
570 		}
571 	} while (zb.flags & GOT_INFLATE_F_HAVE_MORE);
572 
573 done:
574 	if (err == NULL)
575 		rewind(outfile);
576 	got_inflate_end(&zb);
577 	return err;
578 }
579 
580 const struct got_error *
581 got_inflate_to_file_mmap(size_t *outlen, size_t *consumed_total,
582     struct got_inflate_checksum *csum, uint8_t *map, size_t offset,
583     size_t len, FILE *outfile)
584 {
585 	const struct got_error *err;
586 	size_t avail, consumed;
587 	struct got_inflate_buf zb;
588 
589 	err = got_inflate_init(&zb, NULL, GOT_INFLATE_BUFSIZE, csum);
590 	if (err)
591 		goto done;
592 
593 	*outlen = 0;
594 	if (consumed_total)
595 		*consumed_total = 0;
596 	do {
597 		err = got_inflate_read_mmap(&zb, map, offset, len, &avail,
598 		    &consumed);
599 		if (err)
600 			goto done;
601 		offset += consumed;
602 		if (consumed_total)
603 			*consumed_total += consumed;
604 		len -= consumed;
605 		if (avail > 0) {
606 			size_t n;
607 			n = fwrite(zb.outbuf, avail, 1, outfile);
608 			if (n != 1) {
609 				err = got_ferror(outfile, GOT_ERR_IO);
610 				goto done;
611 			}
612 			*outlen += avail;
613 		}
614 	} while (zb.flags & GOT_INFLATE_F_HAVE_MORE);
615 
616 done:
617 	if (err == NULL)
618 		rewind(outfile);
619 	got_inflate_end(&zb);
620 	return err;
621 }