ffmpeg | branch: master | Michael Niedermayer <mich...@niedermayer.cc> | Wed Oct 9 20:39:07 2024 +0200| [3fe3014405494503a03c2e6eff4743db91a21c00] | committer: Michael Niedermayer
swscale/output: used unsigned for bit accumulation Fixes: Integer overflow Fixes: 368725672/clusterfuzz-testcase-minimized-ffmpeg_SWS_fuzzer-5009093023563776 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=3fe3014405494503a03c2e6eff4743db91a21c00 --- libswscale/output.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/libswscale/output.c b/libswscale/output.c index b22db2e48d..0df14e99d6 100644 --- a/libswscale/output.c +++ b/libswscale/output.c @@ -664,7 +664,7 @@ yuv2mono_2_c_template(SwsInternal *c, const int16_t *buf[2], if (c->dither == SWS_DITHER_ED) { int err = 0; - int acc = 0; + unsigned acc = 0; for (i = 0; i < dstW; i +=2) { int Y; @@ -686,7 +686,8 @@ yuv2mono_2_c_template(SwsInternal *c, const int16_t *buf[2], c->dither_error[0][i] = err; } else { for (i = 0; i < dstW; i += 8) { - int Y, acc = 0; + int Y; + unsigned acc = 0; Y = (buf0[i + 0] * yalpha1 + buf1[i + 0] * yalpha) >> 19; accumulate_bit(acc, Y + d128[0]); @@ -721,7 +722,7 @@ yuv2mono_1_c_template(SwsInternal *c, const int16_t *buf0, if (c->dither == SWS_DITHER_ED) { int err = 0; - int acc = 0; + unsigned acc = 0; for (i = 0; i < dstW; i +=2) { int Y; @@ -743,7 +744,7 @@ yuv2mono_1_c_template(SwsInternal *c, const int16_t *buf0, c->dither_error[0][i] = err; } else { for (i = 0; i < dstW; i += 8) { - int acc = 0; + unsigned acc = 0; accumulate_bit(acc, ((buf0[i + 0] + 64) >> 7) + d128[0]); accumulate_bit(acc, ((buf0[i + 1] + 64) >> 7) + d128[1]); accumulate_bit(acc, ((buf0[i + 2] + 64) >> 7) + d128[2]); _______________________________________________ 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".
