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avcodec/jpeg2000dec: Make sure the 4 extra bytes allocated are initialized

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Fixes: use of uninitialized memory
Fixes: 429130590/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEG2000_DEC_fuzzer-5736930522497024

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
2025-08-09 11:38:07 +02:00
committed by michaelni
parent 6d9f0b662f
commit d6fe3786cd
1 changed files with 1 additions and 0 deletions
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libavcodec/jpeg2000dec.c
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@@ -1532,6 +1532,7 @@ static int jpeg2000_decode_packet(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile,
bytestream2_get_bufferu(&s->g, cblk->data + cblk->length, cblk->lengthinc[cwsno]);
cblk->length += cblk->lengthinc[cwsno];
memset(cblk->data + cblk->length, 0, 4);
cblk->lengthinc[cwsno] = 0;
if (cblk->nb_terminationsinc) {
cblk->nb_terminationsinc--;