diff options
| author | Michael Niedermayer <michael@niedermayer.cc> | 2018-07-28 14:09:32 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2018-08-04 16:17:01 +0200 |
| commit | 1940c27c8272843f5139a25758fb92b1b1858cbe (patch) | |
| tree | bd23878aa6d9f6aa7b8e191fe828a01c0e5c9637 /libavcodec | |
| parent | 83dab8183e9f8f6bf8ef492ee372faa43196f8a8 (diff) | |
avcodec/pnm_parser: Avoid reparsing failed data.
Alternatively the parser could be re implemented / redesigned so as to better
and more efficiently find frame boundaries
Fixes: Timeout
Fixes: 9210/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PBM_fuzzer-4770771833454592
Fixes: 9214/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PPM_fuzzer-5741633353023488
Fixes: 9219/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PGM_fuzzer-6249230237696000
Fixes: 9550/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PAM_fuzzer-5312669836902400
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Diffstat (limited to 'libavcodec')
| -rw-r--r-- | libavcodec/pnm_parser.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/libavcodec/pnm_parser.c b/libavcodec/pnm_parser.c index bdd7f2b505..4bcd0ddd5d 100644 --- a/libavcodec/pnm_parser.c +++ b/libavcodec/pnm_parser.c @@ -51,8 +51,9 @@ retry: if (pc->index) { pc->index = 0; } else { - buf++; - buf_size--; + unsigned step = FFMAX(1, pnmctx.bytestream - pnmctx.bytestream_start); + buf += step; + buf_size -= step; } goto retry; } |