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avcodec/utils: Align dimensions by at least their chroma sub-sampling factors.

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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 <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-10-29 14:15:29 +01:00
parent 0c42f47e38
commit df74811cd5
1 changed files with 6 additions and 2 deletions
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8
libavcodec/utils.c
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@ -279,6 +279,12 @@ void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
int i; int i;
int w_align = 1; int w_align = 1;
int h_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) { switch (s->pix_fmt) {
case AV_PIX_FMT_YUV420P: case AV_PIX_FMT_YUV420P:
@ -406,8 +412,6 @@ void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
} }
break; break;
default: default:
w_align = 1;
h_align = 1;
break; break;
} }