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avcodec/tiff: Check subsample & rps values more completely

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Fixes out of array access
Fixes: 83aedfb29af669c4d6e10f1bfad974d2/asan_heap-oob_1ab42fe_4984_9f6ec14462f8d8a00ea24b320572a963.tif

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 89f464e9c2)

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2016-01-18 03:31:25 +01:00
parent 1b6390dd5b
commit eb0872335f
1 changed files with 7 additions and 2 deletions
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9
libavcodec/tiff.c
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@@ -1008,8 +1008,13 @@ static int tiff_decode_tag(TiffContext *s, AVFrame *frame)
av_log(s->avctx, AV_LOG_ERROR, "subsample count invalid\n");
return AVERROR_INVALIDDATA;
}
for (i = 0; i < count; i++)
for (i = 0; i < count; i++) {
s->subsampling[i] = ff_tget(&s->gb, type, s->le);
if (s->subsampling[i] <= 0) {
av_log(s->avctx, AV_LOG_ERROR, "subsampling %d is invalid\n", s->subsampling[i]);
return AVERROR_INVALIDDATA;
}
}
break;
case TIFF_T4OPTIONS:
if (s->compr == TIFF_G3)
@@ -1257,7 +1262,7 @@ static int decode_frame(AVCodecContext *avctx,
avpkt->size - s->strippos);
}
if (s->rps <= 0) {
if (s->rps <= 0 || s->rps % s->subsampling[1]) {
av_log(avctx, AV_LOG_ERROR, "rps %d invalid\n", s->rps);
return AVERROR_INVALIDDATA;
}