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avcodec/tiff: more completely check bpp/bppcount

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Fixes pixel format selection
Fixes out of array accesses
Fixes: asan_heap-oob_1766029_6_asan_heap-oob_20aa045_332_cov_1823216757_m2-d1d366d7965db766c19a66c7a2ccbb6b.tif

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-10-03 16:08:32 +02:00
parent 8b0e96e1f2
commit e1c0cfaa41
1 changed files with 10 additions and 3 deletions
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13
libavcodec/tiff.c
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@ -814,13 +814,13 @@ static int tiff_decode_tag(TiffContext *s, AVFrame *frame)
s->height = value;
break;
case TIFF_BPP:
s->bppcount = count;
if (count > 4) {
if (count > 4U) {
av_log(s->avctx, AV_LOG_ERROR,
"This format is not supported (bpp=%d, %d components)\n",
s->bpp, count);
value, count);
return AVERROR_INVALIDDATA;
}
s->bppcount = count;
if (count == 1)
s->bpp = value;
else {
@ -838,6 +838,13 @@ static int tiff_decode_tag(TiffContext *s, AVFrame *frame)
s->bpp = -1;
}
}
if (s->bpp > 64U) {
av_log(s->avctx, AV_LOG_ERROR,
"This format is not supported (bpp=%d, %d components)\n",
s->bpp, count);
s->bpp = 0;
return AVERROR_INVALIDDATA;
}
break;
case TIFF_SAMPLES_PER_PIXEL:
if (count != 1) {