[FFmpeg-cvslog] avcodec/sonic: Use unsigned temporary in predictor_calc_error()
Michael Niedermayer
git at videolan.org
Thu Apr 1 12:49:37 EEST 2021
ffmpeg | branch: release/4.4 | Michael Niedermayer <michael at niedermayer.cc> | Wed Feb 10 23:05:17 2021 +0100| [59c05f51d544a6e4a760cc73317f6cb2756f3a4b] | committer: Michael Niedermayer
avcodec/sonic: Use unsigned temporary in predictor_calc_error()
Fixes: signed integer overflow: -2147471366 - 18638 cannot be represented in type 'int'
Fixes: 30157/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SONIC_fuzzer-5171199746506752
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 075d793ba87635b77f8302d8a454fa681f90d267)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=59c05f51d544a6e4a760cc73317f6cb2756f3a4b
---
libavcodec/sonic.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/libavcodec/sonic.c b/libavcodec/sonic.c
index 32e94d24f6..c049f6aedc 100644
--- a/libavcodec/sonic.c
+++ b/libavcodec/sonic.c
@@ -475,13 +475,13 @@ static int predictor_calc_error(int *k, int *state, int order, int error)
for (i = order-2; i >= 0; i--, k_ptr--, state_ptr--)
{
int k_value = *k_ptr, state_value = *state_ptr;
- x -= shift_down(k_value * (unsigned)state_value, LATTICE_SHIFT);
+ x -= (unsigned)shift_down(k_value * (unsigned)state_value, LATTICE_SHIFT);
state_ptr[1] = state_value + shift_down(k_value * (unsigned)x, LATTICE_SHIFT);
}
#else
for (i = order-2; i >= 0; i--)
{
- x -= shift_down(k[i] * state[i], LATTICE_SHIFT);
+ x -= (unsigned)shift_down(k[i] * state[i], LATTICE_SHIFT);
state[i+1] = state[i] + shift_down(k[i] * x, LATTICE_SHIFT);
}
#endif
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