ffmpeg | branch: release/4.2 | Michael Niedermayer <mich...@niedermayer.cc> | Mon Aug 7 00:02:21 2023 +0200| [3e3fc9fce41287b88e3290aaad57060bc389276c] | committer: Michael Niedermayer
avcodec/xvididct: Fix integer overflow in idct_row() Fixes: signed integer overflow: -1403461578 + -843974775 cannot be represented in type 'int' Fixes: 60868/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MPEG1VIDEO_fuzzer-4599793035378688 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> (cherry picked from commit 0ce322a51eae87fd3a0eb96f2280175554ef30c5) Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=3e3fc9fce41287b88e3290aaad57060bc389276c --- libavcodec/xvididct.c | 24 ++++++++++++------------ 1 file changed, 12 insertions(+), 12 deletions(-) diff --git a/libavcodec/xvididct.c b/libavcodec/xvididct.c index 360deb3244..8863538529 100644 --- a/libavcodec/xvididct.c +++ b/libavcodec/xvididct.c @@ -69,24 +69,24 @@ static int idct_row(short *in, const int *const tab, int rnd) if (!(right | in[4])) { const int k = c4 * in[0] + rnd; if (left) { - const int a0 = k + c2 * in[2]; - const int a1 = k + c6 * in[2]; - const int a2 = k - c6 * in[2]; - const int a3 = k - c2 * in[2]; + const unsigned a0 = k + c2 * in[2]; + const unsigned a1 = k + c6 * in[2]; + const unsigned a2 = k - c6 * in[2]; + const unsigned a3 = k - c2 * in[2]; const int b0 = c1 * in[1] + c3 * in[3]; const int b1 = c3 * in[1] - c7 * in[3]; const int b2 = c5 * in[1] - c1 * in[3]; const int b3 = c7 * in[1] - c5 * in[3]; - in[0] = (a0 + b0) >> ROW_SHIFT; - in[1] = (a1 + b1) >> ROW_SHIFT; - in[2] = (a2 + b2) >> ROW_SHIFT; - in[3] = (a3 + b3) >> ROW_SHIFT; - in[4] = (a3 - b3) >> ROW_SHIFT; - in[5] = (a2 - b2) >> ROW_SHIFT; - in[6] = (a1 - b1) >> ROW_SHIFT; - in[7] = (a0 - b0) >> ROW_SHIFT; + in[0] = (int)(a0 + b0) >> ROW_SHIFT; + in[1] = (int)(a1 + b1) >> ROW_SHIFT; + in[2] = (int)(a2 + b2) >> ROW_SHIFT; + in[3] = (int)(a3 + b3) >> ROW_SHIFT; + in[4] = (int)(a3 - b3) >> ROW_SHIFT; + in[5] = (int)(a2 - b2) >> ROW_SHIFT; + in[6] = (int)(a1 - b1) >> ROW_SHIFT; + in[7] = (int)(a0 - b0) >> ROW_SHIFT; } else { const int a0 = k >> ROW_SHIFT; if (a0) { _______________________________________________ ffmpeg-cvslog mailing list ffmpeg-cvslog@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-cvslog To unsubscribe, visit link above, or email ffmpeg-cvslog-requ...@ffmpeg.org with subject "unsubscribe".
