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avcodec/aacsbr_fixed: Check shift in sbr_hf_assemble()

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Fixes: runtime error: shift exponent -10 is negative

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 d1992448d3)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-06-13 16:25:59 +02:00
parent d2567caea9
commit 3c98e4be89
1 changed files with 13 additions and 5 deletions

18
libavcodec/aacsbr_fixed.c
View File

@ -575,22 +575,30 @@ static void sbr_hf_assemble(int Y1[38][64][2],
SoftFloat *in = sbr->s_m[e];
for (m = 0; m+1 < m_max; m+=2) {
int shift2;
shift = 22 - in[m ].exp;
shift2= 22 - in[m+1].exp;
if (shift < 1 || shift2 < 1) {
av_log(NULL, AV_LOG_ERROR, "Overflow in sbr_hf_assemble, shift=%d,%d\n", shift, shift2);
return;
}
if (shift < 32) {
round = 1 << (shift-1);
out[2*m ] += (in[m ].mant * A + round) >> shift;
}
shift = 22 - in[m+1].exp;
if (shift < 32) {
round = 1 << (shift-1);
out[2*m+2] += (in[m+1].mant * B + round) >> shift;
if (shift2 < 32) {
round = 1 << (shift2-1);
out[2*m+2] += (in[m+1].mant * B + round) >> shift2;
}
}
if(m_max&1)
{
shift = 22 - in[m ].exp;
if (shift < 32) {
if (shift < 1) {
av_log(NULL, AV_LOG_ERROR, "Overflow in sbr_hf_assemble, shift=%d\n", shift);
return;
} else if (shift < 32) {
round = 1 << (shift-1);
out[2*m ] += (in[m ].mant * A + round) >> shift;
}