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swscale/output: fix integer overflow in yuv2rgba64_full_1_c_template()

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Fixes: signed integer overflow: -293650 * 16525 cannot be represented in type 'int'
Fixes: 408304111/clusterfuzz-testcase-minimized-ffmpeg_SWS_fuzzer-4762210299871232

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
2025-05-11 23:25:07 +02:00
parent 05f8c8c4c2
commit 23592f942d
1 changed files with 4 additions and 4 deletions
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8
libswscale/output.c
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@ -1435,8 +1435,8 @@ yuv2rgba64_full_1_c_template(SwsInternal *c, const int32_t *buf0,
if (uvalpha == 0) {
for (i = 0; i < dstW; i++) {
SUINT Y = (buf0[i]) >> 2;
int U = (ubuf0[i] - (128 << 11)) >> 2;
int V = (vbuf0[i] - (128 << 11)) >> 2;
SUINT U = (ubuf0[i] - (128 << 11)) >> 2;
SUINT V = (vbuf0[i] - (128 << 11)) >> 2;
int R, G, B;
Y -= c->yuv2rgb_y_offset;
@ -1471,8 +1471,8 @@ yuv2rgba64_full_1_c_template(SwsInternal *c, const int32_t *buf0,
for (i = 0; i < dstW; i++) {
SUINT Y = (buf0[i] ) >> 2;
int U = (ubuf0[i] * uvalpha1 + ubuf1[i] * uvalpha - (128 << 23)) >> 14;
int V = (vbuf0[i] * uvalpha1 + vbuf1[i] * uvalpha - (128 << 23)) >> 14;
SUINT U = (ubuf0[i] * uvalpha1 + ubuf1[i] * uvalpha - (128 << 23)) >> 14;
SUINT V = (vbuf0[i] * uvalpha1 + vbuf1[i] * uvalpha - (128 << 23)) >> 14;
int R, G, B;
Y -= c->yuv2rgb_y_offset;