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avcodec/pgssubdec: Check dimensions for 0 

Fixes division by 0
Fixes: b293a6479bb4b5286cff24d356bfd955/asan_generic_225c3c9_7819_cc526b657450c6cdef1371b526499626.mkv

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2015-11-14 18:06:37 +01:00
parent ac6ab77741
commit ebf5264cd6
1 changed files with 2 additions and 2 deletions
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4
libavcodec/pgssubdec.c
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@ -290,8 +290,8 @@ static int parse_object_segment(AVCodecContext *avctx,
height = bytestream_get_be16(&buf);
/* Make sure the bitmap is not too large */
if (avctx->width < width || avctx->height < height) {
av_log(avctx, AV_LOG_ERROR, "Bitmap dimensions larger than video.\n");
if (avctx->width < width || avctx->height < height || !width || !height) {
av_log(avctx, AV_LOG_ERROR, "Bitmap dimensions (%dx%d) invalid.\n", width, height);
return AVERROR_INVALIDDATA;
}