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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>
(cherry picked from commit d6fe3786cd)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2025-08-09 11:38:07 +02:00
parent 8577a6b2fe
commit 435b00a7cc
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libavcodec/jpeg2000dec.c
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@ -1231,6 +1231,7 @@ 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--;