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| author | Michael Niedermayer <michael@niedermayer.cc> | 2023-04-09 15:18:55 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2023-04-15 22:38:13 +0200 |
| commit | 538fe62224941081893fb9a2ba9baed2b027198f (patch) | |
| tree | 4a8e3e6fff4365ccb2aedaff70c6769b73edd80a | |
| parent | 07990a8d62da8a36c79d1a65d30d09d9a3243013 (diff) | |
| download | ffmpeg-538fe62224941081893fb9a2ba9baed2b027198f.tar.gz | |
avcodec/escape124: Check that blocks are allocated before use
Fixes: NULL pointer dereference
Fixes: 57819/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ESCAPE124_fuzzer-5077280228769792
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 5366ae12b9ba60404822f6b39b41f6c0d98a7c8a)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/escape124.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/libavcodec/escape124.c b/libavcodec/escape124.c index 58278ecaa7..3d5f2ae79a 100644 --- a/libavcodec/escape124.c +++ b/libavcodec/escape124.c @@ -157,7 +157,7 @@ static MacroBlock decode_macroblock(Escape124Context* s, GetBitContext* gb, // This condition can occur with invalid bitstreams and // *codebook_index == 2 - if (block_index >= s->codebooks[*codebook_index].size) + if (block_index >= s->codebooks[*codebook_index].size || !s->codebooks[*codebook_index].blocks) return (MacroBlock) { { 0 } }; return s->codebooks[*codebook_index].blocks[block_index]; |