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avcodec/lpc: signed integer overflow in compute_lpc_coefs() (aacdec_fixed)

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Fixes: runtime error: signed integer overflow: -1575818955 + -915383657 cannot be represented in type 'int'
Fixes: 2224/clusterfuzz-testcase-minimized-6208559949807616

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 2017-06-15 01:35:49 +02:00
parent 19bf50406e
commit e95fcfe8fb
1 changed files with 5 additions and 2 deletions
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7
libavcodec/lpc.h
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@ -117,11 +117,14 @@ void ff_lpc_end(LPCContext *s);
#if USE_FIXED
typedef int LPC_TYPE;
typedef unsigned LPC_TYPE_U;
#else
#ifdef LPC_USE_DOUBLE
typedef double LPC_TYPE;
typedef double LPC_TYPE_U;
#else
typedef float LPC_TYPE;
typedef float LPC_TYPE_U;
#endif
#endif // USE_FIXED
@ -192,8 +195,8 @@ static inline int AAC_RENAME(compute_lpc_coefs)(const LPC_TYPE *autoc, int max_o
for(j=0; j < (i+1)>>1; j++) {
LPC_TYPE f = lpc_last[ j];
LPC_TYPE b = lpc_last[i-1-j];
lpc[ j] = f + AAC_MUL26(r, b);
lpc[i-1-j] = b + AAC_MUL26(r, f);
lpc[ j] = f + (LPC_TYPE_U)AAC_MUL26(r, b);
lpc[i-1-j] = b + (LPC_TYPE_U)AAC_MUL26(r, f);
}
if (fail && err < 0)