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tiff: Check that there is no aliasing in pixel format selection

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Fixes possible issues with unexpected bpp/bppcount values.

CC: libav-stable@libav.org
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Bug-Id: CVE-2014-8544
(cherry picked from commit ae5e1f3d663a8c9a532d89e588cbc61f171c9186)
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
This commit is contained in:
Anton Khirnov 2015-03-07 22:06:59 +01:00 committed by Luca Barbato
parent f3dafb63d0
commit 77eb3d9a60
1 changed files with 8 additions and 0 deletions
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8
libavcodec/tiff.c
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@ -248,6 +248,14 @@ static int init_image(TiffContext *s, AVFrame *frame)
{
int ret;
// make sure there is no aliasing in the following switch
if (s->bpp >= 100 || s->bppcount >= 10) {
av_log(s->avctx, AV_LOG_ERROR,
"Unsupported image parameters: bpp=%d, bppcount=%d\n",
s->bpp, s->bppcount);
return AVERROR_INVALIDDATA;
}
switch (s->bpp * 10 + s->bppcount) {
case 11:
s->avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;