mirror of https://git.ffmpeg.org/ffmpeg.git
h264: increase scantable sizes to avoid overread
We could also check the index but this would slow speed critical code down. Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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@ -52,18 +52,20 @@ static const uint8_t golomb_to_inter_cbp[48] = {
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17, 18, 20, 24, 19, 21, 26, 28, 23, 27, 29, 30, 22, 25, 38, 41
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};
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static const uint8_t zigzag_scan[16] = {
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static const uint8_t zigzag_scan[16+1] = {
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0 + 0 * 4, 1 + 0 * 4, 0 + 1 * 4, 0 + 2 * 4,
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1 + 1 * 4, 2 + 0 * 4, 3 + 0 * 4, 2 + 1 * 4,
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1 + 2 * 4, 0 + 3 * 4, 1 + 3 * 4, 2 + 2 * 4,
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3 + 1 * 4, 3 + 2 * 4, 2 + 3 * 4, 3 + 3 * 4,
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0,
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};
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static const uint8_t field_scan[16] = {
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static const uint8_t field_scan[16+1] = {
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0 + 0 * 4, 0 + 1 * 4, 1 + 0 * 4, 0 + 2 * 4,
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0 + 3 * 4, 1 + 1 * 4, 1 + 2 * 4, 1 + 3 * 4,
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2 + 0 * 4, 2 + 1 * 4, 2 + 2 * 4, 2 + 3 * 4,
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3 + 0 * 4, 3 + 1 * 4, 3 + 2 * 4, 3 + 3 * 4,
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0,
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};
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static const uint8_t luma_dc_zigzag_scan[16] = {
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@ -93,7 +95,7 @@ static const uint8_t chroma422_dc_scan[8] = {
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};
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// zigzag_scan8x8_cavlc[i] = zigzag_scan8x8[(i/4) + 16*(i%4)]
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static const uint8_t zigzag_scan8x8_cavlc[64] = {
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static const uint8_t zigzag_scan8x8_cavlc[64+1] = {
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0 + 0 * 8, 1 + 1 * 8, 1 + 2 * 8, 2 + 2 * 8,
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4 + 1 * 8, 0 + 5 * 8, 3 + 3 * 8, 7 + 0 * 8,
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3 + 4 * 8, 1 + 7 * 8, 5 + 3 * 8, 6 + 3 * 8,
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@ -110,9 +112,10 @@ static const uint8_t zigzag_scan8x8_cavlc[64] = {
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1 + 4 * 8, 2 + 4 * 8, 6 + 0 * 8, 4 + 3 * 8,
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0 + 7 * 8, 4 + 4 * 8, 7 + 2 * 8, 3 + 6 * 8,
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5 + 5 * 8, 6 + 5 * 8, 6 + 6 * 8, 7 + 7 * 8,
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0,
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};
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static const uint8_t field_scan8x8[64] = {
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static const uint8_t field_scan8x8[64+1] = {
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0 + 0 * 8, 0 + 1 * 8, 0 + 2 * 8, 1 + 0 * 8,
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1 + 1 * 8, 0 + 3 * 8, 0 + 4 * 8, 1 + 2 * 8,
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2 + 0 * 8, 1 + 3 * 8, 0 + 5 * 8, 0 + 6 * 8,
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@ -129,9 +132,10 @@ static const uint8_t field_scan8x8[64] = {
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7 + 0 * 8, 7 + 1 * 8, 6 + 4 * 8, 6 + 5 * 8,
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6 + 6 * 8, 6 + 7 * 8, 7 + 2 * 8, 7 + 3 * 8,
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7 + 4 * 8, 7 + 5 * 8, 7 + 6 * 8, 7 + 7 * 8,
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0,
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};
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static const uint8_t field_scan8x8_cavlc[64] = {
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static const uint8_t field_scan8x8_cavlc[64+1] = {
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0 + 0 * 8, 1 + 1 * 8, 2 + 0 * 8, 0 + 7 * 8,
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2 + 2 * 8, 2 + 3 * 8, 2 + 4 * 8, 3 + 3 * 8,
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3 + 4 * 8, 4 + 3 * 8, 4 + 4 * 8, 5 + 3 * 8,
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@ -148,6 +152,7 @@ static const uint8_t field_scan8x8_cavlc[64] = {
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1 + 7 * 8, 3 + 2 * 8, 2 + 7 * 8, 4 + 2 * 8,
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3 + 7 * 8, 5 + 2 * 8, 4 + 7 * 8, 5 + 4 * 8,
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6 + 3 * 8, 6 + 5 * 8, 7 + 3 * 8, 7 + 7 * 8,
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0,
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};
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typedef struct IMbInfo {
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