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avcodec/aacsbr_fixed: Fix overflows in rounding in sbr_hf_assemble()

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Fixes: runtime error: signed integer overflow: 2052929346 + 204817098 cannot be represented in type 'int'
Fixes: 5275/clusterfuzz-testcase-minimized-5367635958038528

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit b1bef755f6)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-01-31 18:13:07 +01:00
parent c95d343ae1
commit 5b6324a94c
1 changed files with 5 additions and 4 deletions
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9
libavcodec/aacsbr_fixed.c
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@ -575,7 +575,8 @@ static void sbr_hf_assemble(int Y1[38][64][2],
int A = (1-((indexsine+(kx & 1))&2));
int B = (A^(-idx)) + idx;
int *out = &Y1[i][kx][idx];
int shift, round;
int shift;
unsigned round;
SoftFloat *in = sbr->s_m[e];
for (m = 0; m+1 < m_max; m+=2) {
@ -588,12 +589,12 @@ static void sbr_hf_assemble(int Y1[38][64][2],
}
if (shift < 32) {
round = 1 << (shift-1);
out[2*m ] += (in[m ].mant * A + round) >> shift;
out[2*m ] += (int)(in[m ].mant * A + round) >> shift;
}
if (shift2 < 32) {
round = 1 << (shift2-1);
out[2*m+2] += (in[m+1].mant * B + round) >> shift2;
out[2*m+2] += (int)(in[m+1].mant * B + round) >> shift2;
}
}
if(m_max&1)
@ -604,7 +605,7 @@ static void sbr_hf_assemble(int Y1[38][64][2],
return;
} else if (shift < 32) {
round = 1 << (shift-1);
out[2*m ] += (in[m ].mant * A + round) >> shift;
out[2*m ] += (int)(in[m ].mant * A + round) >> shift;
}
}
}