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

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

Michael Niedermayer committed 1 year ago

Commit d6fe3781 parent 6d9f0b61 file · +1 −0Browse files

Unified · Split

@@ -1532,6 +1532,7 @@ static int jpeg2000_decode_packet(Jpeg2000DecoderContext s, Jpeg2000Tile tile, · 1531 unmodified lines
1532		1532
1533	bytestream2_get_bufferu(&s->g, cblk->data + cblk->length, cblk->lengthinc[cwsno]);	1533	bytestream2_get_bufferu(&s->g, cblk->data + cblk->length, cblk->lengthinc[cwsno]);
1534	cblk->length += cblk->lengthinc[cwsno];	1534	cblk->length += cblk->lengthinc[cwsno];
		1535	memset(cblk->data + cblk->length, 0, 4);
1535	cblk->lengthinc[cwsno] = 0;	1536	cblk->lengthinc[cwsno] = 0;
1536	if (cblk->nb_terminationsinc) {	1537	if (cblk->nb_terminationsinc) {
1537	cblk->nb_terminationsinc--;	1538	cblk->nb_terminationsinc--;

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