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author | Andreas Rheinhardt <andreas.rheinhardt@gmail.com> | 2020-12-11 01:46:15 +0100 |
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committer | Andreas Rheinhardt <andreas.rheinhardt@gmail.com> | 2020-12-11 01:46:15 +0100 |
commit | 43b4c66e6b7dc788b8c6e4c9cfdb08bfa5ef2360 (patch) | |
tree | a8fc54c0c2092f854996307e3d07671a4c7b2459 /libavformat/utils.c | |
parent | 7ab5192260c387a10998481fe1468f1304f6ebd2 (diff) |
avformat/utils: Improve ffio_limit logic
The earlier code would not complain if the remaining size was one byte
short of the desired size; and the way it performed the check could run
into signed integer overflow.
Fixes: signed integer overflow: 9223372036854775807 + 1 cannot be represented in type 'long'
Fixes: Timeout
Fixes: 26434/clusterfuzz-testcase-minimized-ffmpeg_dem_MV_fuzzer-5752845451919360
Fixes: 26444/clusterfuzz-testcase-minimized-ffmpeg_dem_BINK_fuzzer-4697773380993024
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Diffstat (limited to 'libavformat/utils.c')
-rw-r--r-- | libavformat/utils.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/libavformat/utils.c b/libavformat/utils.c index 503e583ad0..1a87d9422a 100644 --- a/libavformat/utils.c +++ b/libavformat/utils.c @@ -253,9 +253,11 @@ int ffio_limit(AVIOContext *s, int size) remaining= FFMAX(remaining, 0); } - if (s->maxsize>= 0 && remaining+1 < size) { - av_log(NULL, remaining ? AV_LOG_ERROR : AV_LOG_DEBUG, "Truncating packet of size %d to %"PRId64"\n", size, remaining+1); - size = remaining+1; + if (s->maxsize >= 0 && remaining < size && size > 1) { + av_log(NULL, remaining ? AV_LOG_ERROR : AV_LOG_DEBUG, + "Truncating packet of size %d to %"PRId64"\n", + size, remaining + !remaining); + size = remaining + !remaining; } } return size; |