From b92ccfefc3a3d9a43c6de78ea51c080bb22d7ef3 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Wed, 29 Oct 2014 14:15:29 +0100 Subject: [PATCH] avcodec/utils: Align dimensions by at least their chroma sub-sampling factors. Fixes: out of array accesses Fixes: asan_heap-oob_112c6b3_13_012.avi Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind Signed-off-by: Michael Niedermayer (cherry picked from commit df74811cd53e45fcbbd3b77a1c42416816687c5c) Signed-off-by: Michael Niedermayer --- libavcodec/utils.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/libavcodec/utils.c b/libavcodec/utils.c index 33ff8e0110..7cceafa3a4 100644 --- a/libavcodec/utils.c +++ b/libavcodec/utils.c @@ -193,6 +193,12 @@ void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height, int i; int w_align = 1; int h_align = 1; + AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->pix_fmt); + + if (desc) { + w_align = 1 << desc->log2_chroma_w; + h_align = 1 << desc->log2_chroma_h; + } switch (s->pix_fmt) { case AV_PIX_FMT_YUV420P: @@ -293,8 +299,6 @@ void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height, } break; default: - w_align = 1; - h_align = 1; break; }