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| author | Michael Niedermayer <michael@niedermayer.cc> | 2020-02-03 23:20:23 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2020-04-16 00:56:49 +0200 |
| commit | 55f9683cf6be97f4b398a7a35ee5bfd1208ac2a5 (patch) | |
| tree | 23c3c9387daaddf37cc86bef0f19144ca7fbdde1 | |
| parent | abb5762e985f4ce34e97c1b2fa6d1108ce8a881f (diff) | |
| download | ffmpeg-55f9683cf6be97f4b398a7a35ee5bfd1208ac2a5.tar.gz | |
avcodec/flac_parser: Do not lose header count in find_headers_search()
Fixes: Timeout
Fixes: out of array access
Fixes: 20274/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FLAC_fuzzer-5649631988154368
Fixes: 19275/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FLAC_fuzzer-5757535722405888
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/flac_parser.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/libavcodec/flac_parser.c b/libavcodec/flac_parser.c index 9ffa288548..3424583c49 100644 --- a/libavcodec/flac_parser.c +++ b/libavcodec/flac_parser.c @@ -208,16 +208,20 @@ static int find_headers_search(FLACParseContext *fpc, uint8_t *buf, uint32_t x; for (i = 0; i < mod_offset; i++) { - if ((AV_RB16(buf + i) & 0xFFFE) == 0xFFF8) - size = find_headers_search_validate(fpc, search_start + i); + if ((AV_RB16(buf + i) & 0xFFFE) == 0xFFF8) { + int ret = find_headers_search_validate(fpc, search_start + i); + size = FFMAX(size, ret); + } } for (; i < buf_size - 1; i += 4) { x = AV_RN32(buf + i); if (((x & ~(x + 0x01010101)) & 0x80808080)) { for (j = 0; j < 4; j++) { - if ((AV_RB16(buf + i + j) & 0xFFFE) == 0xFFF8) - size = find_headers_search_validate(fpc, search_start + i + j); + if ((AV_RB16(buf + i + j) & 0xFFFE) == 0xFFF8) { + int ret = find_headers_search_validate(fpc, search_start + i + j); + size = FFMAX(size, ret); + } } } } |