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Code Issues Releases Activity

avcodec/jfdctint_template: Fewer integer anomalies

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Fixes: signed integer overflow: 105788 * -20995 cannot be represented in type 'int'
Fixes: signed integer overflow: 923211729 + 2073948236 cannot be represented in type 'int'
Fixes: signed integer overflow: 1281179284 + 2073948236 cannot be represented in type 'int'
Fixes: 68975/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PRORES_fuzzer-6266769177116672
Fixes: 68997/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PRORES_KS_fuzzer-6284237161431040

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 2024-06-18 15:48:24 +02:00
parent 3a9292aff3
commit 228f255b5d
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GPG Key ID: B18E8928B3948D64
1 changed files with 3 additions and 3 deletions
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6
libavcodec/jfdctint_template.c
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@ -69,7 +69,7 @@
#define GLOBAL(x) x
#define RIGHT_SHIFT(x, n) ((x) >> (n))
#define MULTIPLY16C16(var,const) ((var)*(const))
#define DESCALE(x,n) RIGHT_SHIFT((x) + (1 << ((n) - 1)), n)
#define DESCALE(x,n) RIGHT_SHIFT((int)(x) + (1 << ((n) - 1)), n)
/*
@ -175,7 +175,7 @@
#if BITS_IN_JSAMPLE == 8 && CONST_BITS<=13 && PASS1_BITS<=2
#define MULTIPLY(var,const) MULTIPLY16C16(var,const)
#else
#define MULTIPLY(var,const) ((var) * (const))
#define MULTIPLY(var,const) (int)((var) * (unsigned)(const))
#endif
@ -261,7 +261,7 @@ FUNC(ff_jpeg_fdct_islow)(int16_t *data)
{
int tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
int tmp10, tmp11, tmp12, tmp13;
int z1, z2, z3, z4, z5;
unsigned z1, z2, z3, z4, z5;
int16_t *dataptr;
int ctr;