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mpegvideo: Fix long standing race condition with frame threads

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Since resolution change support this also was exploitable, which is
how it was found.

Fixes read after free and out of array reads.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer
2013-01-15 04:58:22 +01:00
parent df4203ac6f
commit 8ac8f04993
2 changed files with 10 additions and 3 deletions
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4
libavcodec/mpegvideo.h
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@@ -60,8 +60,7 @@ enum OutputFormat {
#define MAX_MV 2048
#define MAX_THREADS 32
#define MAX_PICTURE_COUNT 34
#define MAX_PICTURE_COUNT 36
#define ME_MAP_SIZE 64
#define ME_MAP_SHIFT 3
@@ -149,6 +148,7 @@ typedef struct Picture{
int b_frame_score; /* */
struct MpegEncContext *owner2; ///< pointer to the MpegEncContext that allocated this picture
int needs_realloc; ///< Picture needs to be reallocated (eg due to a frame size change)
int period_since_free; ///< "cycles" since this Picture has been freed
} Picture;
/**