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avcodec/diracdec: Fix overflow in DC computation 

Fixes: runtime error: signed integer overflow: 11896 + 2147483646 cannot be represented in type 'int'
Fixes: 3053/clusterfuzz-testcase-minimized-6355082062856192

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 b5995856a4)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-09-10 01:32:50 +02:00
parent b590758298
commit a295d1870a
1 changed files with 1 additions and 1 deletions
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libavcodec/diracdec.c
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@ -1422,7 +1422,7 @@ static void decode_block_params(DiracContext *s, DiracArith arith[8], DiracBlock
if (!block->ref) { if (!block->ref) {
pred_block_dc(block, stride, x, y); pred_block_dc(block, stride, x, y);
for (i = 0; i < 3; i++) for (i = 0; i < 3; i++)
block->u.dc[i] += dirac_get_arith_int(arith+1+i, CTX_DC_F1, CTX_DC_DATA); block->u.dc[i] += (unsigned)dirac_get_arith_int(arith+1+i, CTX_DC_F1, CTX_DC_DATA);
return; return;
} }