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avcodec/jpegls: Check A[Q] for overflow in ff_jpegls_update_state_regular() 

Fixes: Timeout
Fixes: 30912/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MJPEG_fuzzer-5556235476795392

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-03-02 20:07:13 +01:00
parent 337984c133
commit 8a3fea802a
1 changed files with 1 additions and 1 deletions
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2
libavcodec/jpegls.h
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@ -95,7 +95,7 @@ static inline void ff_jpegls_downscale_state(JLSState *state, int Q)
static inline int ff_jpegls_update_state_regular(JLSState *state,
int Q, int err)
{
if(FFABS(err) > 0xFFFF)
if(FFABS(err) > 0xFFFF || FFABS(err) > INT_MAX - state->A[Q])
return -0x10000;
state->A[Q] += FFABS(err);
err *= state->twonear;