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avcodec/jpeg2000dec: check transform equality in MCT

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Fixes null pointer dereference
Fixes Ticket2843

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-08-19 03:33:40 +02:00
parent 522f78f8ea
commit ac3b01a9c0
1 changed files with 6 additions and 0 deletions
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6
libavcodec/jpeg2000dec.c
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@ -1140,6 +1140,12 @@ static void mct_decode(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile)
int32_t *src[3], i0, i1, i2;
float *srcf[3], i0f, i1f, i2f;
for (i = 1; i < 3; i++)
if (tile->codsty[0].transform != tile->codsty[i].transform) {
av_log(s->avctx, AV_LOG_ERROR, "Transforms mismatch, MCT not supported\n");
return;
}
for (i = 0; i < 3; i++)
if (tile->codsty[0].transform == FF_DWT97)
srcf[i] = tile->comp[i].f_data;