From 0ce3a0f9d9523a9bcad4c6d451ca5bbd7a4f420d Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Wed, 4 Mar 2015 17:36:14 +0000 Subject: [PATCH] utvideodec: Handle slice_height being zero Fixes out of array accesses. CC: libav-stable@libav.org Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind Bug-Id: CVE-2014-9604 Signed-off-by: Vittorio Giovara Signed-off-by: Luca Barbato --- libavcodec/utvideodec.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/libavcodec/utvideodec.c b/libavcodec/utvideodec.c index 7d75c59336..bb8c7aac1e 100644 --- a/libavcodec/utvideodec.c +++ b/libavcodec/utvideodec.c @@ -213,6 +213,8 @@ static void restore_median(uint8_t *src, int step, int stride, slice_start = ((slice * height) / slices) & cmask; slice_height = ((((slice + 1) * height) / slices) & cmask) - slice_start; + if (!slice_height) + continue; bsrc = src + slice_start * stride; @@ -269,6 +271,8 @@ static void restore_median_il(uint8_t *src, int step, int stride, slice_height = ((((slice + 1) * height) / slices) & cmask) - slice_start; slice_height >>= 1; + if (!slice_height) + continue; bsrc = src + slice_start * stride;