On Tue, Jun 18, 2019 at 02:55:02PM +0200, Michael Niedermayer wrote: > Fixes: signed integer overflow: 3784 * 682038 cannot be represented in type > 'int' > Fixes: > 15265/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_BINK_fuzzer-5088311799971840 > Fixes: > 15268/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_BINK_fuzzer-5666502344179712 > > Found-by: continuous fuzzing process > https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg > Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> > --- > libavcodec/binkdsp.c | 12 +++++++----- > 1 file changed, 7 insertions(+), 5 deletions(-) > > diff --git a/libavcodec/binkdsp.c b/libavcodec/binkdsp.c > index 9d70e2326f..a357d31672 100644 > --- a/libavcodec/binkdsp.c > +++ b/libavcodec/binkdsp.c > @@ -33,20 +33,22 @@ > #define A3 3784 > #define A4 -5352 > > +#define MUL(X,Y) ((int)((unsigned)(X) * (Y)) >> 11) > + > #define > IDCT_TRANSFORM(dest,s0,s1,s2,s3,s4,s5,s6,s7,d0,d1,d2,d3,d4,d5,d6,d7,munge,src) > {\ > const int a0 = (src)[s0] + (src)[s4]; \ > const int a1 = (src)[s0] - (src)[s4]; \ > const int a2 = (src)[s2] + (src)[s6]; \ > - const int a3 = (A1*((src)[s2] - (src)[s6])) >> 11; \ > + const int a3 = MUL(A1, (src)[s2] - (src)[s6]); \ > const int a4 = (src)[s5] + (src)[s3]; \ > const int a5 = (src)[s5] - (src)[s3]; \ > const int a6 = (src)[s1] + (src)[s7]; \ > const int a7 = (src)[s1] - (src)[s7]; \ > const int b0 = a4 + a6; \ > - const int b1 = (A3*(a5 + a7)) >> 11; \ > - const int b2 = ((A4*a5) >> 11) - b0 + b1; \ > - const int b3 = (A1*(a6 - a4) >> 11) - b2; \ > - const int b4 = ((A2*a7) >> 11) + b3 - b1; \ > + const int b1 = MUL(A3, a5 + a7); \ > + const int b2 = MUL(A4, a5) - b0 + b1; \ > + const int b3 = MUL(A1, a6 - a4) - b2; \ > + const int b4 = MUL(A2, a7) + b3 - b1; \ > (dest)[d0] = munge(a0+a2 +b0); \ > (dest)[d1] = munge(a1+a3-a2+b2); \ > (dest)[d2] = munge(a1-a3+a2+b3); \ > -- > 2.21.0
approve both parts 1 & 2. have also tested these changes against my pile of reference binkb files. -- Peter (A907 E02F A6E5 0CD2 34CD 20D2 6760 79C5 AC40 DD6B)
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