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avcodec/mv30: Fix multiple integer overflows in idct_1d()

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Fixes: signed integer overflow: -4869937 * 473 cannot be represented in type 'int'
Fixes: 21934/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MV30_fuzzer-5667289925156864

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-05-23 21:52:25 +02:00
parent e73a251680
commit 7f817853cd
1 changed files with 5 additions and 5 deletions
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10
libavcodec/mv30.c
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@ -107,7 +107,7 @@ static inline void idct_1d(int *blk, int step)
const int t0 = blk[0 * step] + blk[4 * step];
const int t1 = blk[0 * step] - blk[4 * step];
const int t2 = blk[2 * step] + blk[6 * step];
const int t3 = (((blk[2 * step] - blk[6 * step]) * 362) >> 8) - t2;
const int t3 = ((int)((blk[2 * step] - blk[6 * step]) * 362U) >> 8) - t2;
const int t4 = t0 + t2;
const int t5 = t0 - t2;
const int t6 = t1 + t3;
@ -117,10 +117,10 @@ static inline void idct_1d(int *blk, int step)
const int tA = blk[1 * step] + blk[7 * step];
const int tB = blk[1 * step] - blk[7 * step];
const int tC = t8 + tA;
const int tD = (tB + t9) * 473 >> 8;
const int tE = ((t9 * -669 >> 8) - tC) + tD;
const int tF = ((tA - t8) * 362 >> 8) - tE;
const int t10 = ((tB * 277 >> 8) - tD) + tF;
const int tD = (int)((tB + t9) * 473U) >> 8;
const int tE = (((int)(t9 * -669U) >> 8) - tC) + tD;
const int tF = ((int)((tA - t8) * 362U) >> 8) - tE;
const int t10 = (((int)(tB * 277U) >> 8) - tD) + tF;
blk[0 * step] = t4 + tC;
blk[1 * step] = t6 + tE;