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avcodec/h263dec: Check slice_ret in mspeg4 slice loop

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Fixes infinite loop
Fixes: 6858/clusterfuzz-testcase-ffmpeg_AV_CODEC_ID_MSMPEG4V3_fuzzer-4681563766784000
Fixes: 6890/clusterfuzz-testcase-ffmpeg_AV_CODEC_ID_WMV1_fuzzer-4756103142309888

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit de841fbea7655b74a9663001e01008a86c88779a)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-04-22 21:07:45 +02:00
parent 24947b3f7d
commit 3b23dd4b91
1 changed files with 1 additions and 1 deletions
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2
libavcodec/h263dec.c
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@ -637,7 +637,7 @@ retry:
slice_ret = decode_slice(s);
while (s->mb_y < s->mb_height) {
if (s->msmpeg4_version) {
if (s->slice_height == 0 || s->mb_x != 0 ||
if (s->slice_height == 0 || s->mb_x != 0 || slice_ret < 0 ||
(s->mb_y % s->slice_height) != 0 || get_bits_left(&s->gb) < 0)
break;
} else {