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avcodec/fic: fix slice checks

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fix integer overflows

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
This commit is contained in:
Michael Niedermayer 2014-02-15 17:19:32 +01:00 committed by Derek Buitenhuis
parent 93e15a3238
commit f34d3173fc
1 changed files with 5 additions and 5 deletions
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10
libavcodec/fic.c
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@ -263,8 +263,8 @@ static int fic_decode_frame(AVCodecContext *avctx, void *data,
}
for (slice = 0; slice < nslices; slice++) {
int slice_off = AV_RB32(src + tsize + FIC_HEADER_SIZE + slice * 4);
int slice_size;
unsigned slice_off = AV_RB32(src + tsize + FIC_HEADER_SIZE + slice * 4);
unsigned slice_size;
int y_off = ctx->slice_h * slice;
int slice_h = ctx->slice_h;
@ -279,11 +279,11 @@ static int fic_decode_frame(AVCodecContext *avctx, void *data,
slice_size = AV_RB32(src + tsize + FIC_HEADER_SIZE + slice * 4 + 4);
}
slice_size -= slice_off;
if (slice_off > msize || slice_off + slice_size > msize)
if (slice_size < slice_off || slice_size > msize)
continue;
slice_size -= slice_off;
ctx->slice_data[slice].src = sdata + slice_off;
ctx->slice_data[slice].src_size = slice_size;
ctx->slice_data[slice].slice_h = slice_h;