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| author | Michael Niedermayer <michael@niedermayer.cc> | 2021-05-28 20:31:19 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2021-05-29 20:14:24 +0200 |
| commit | 38d18fb57863bb9c54e68ae44aa780c5c282a184 (patch) | |
| tree | 0905625e67e965ce090e6c15fc002233d3d0c8bf | |
| parent | 223b5e8ac9f6461bb13ed365419ec485c5b2b002 (diff) | |
| download | ffmpeg-38d18fb57863bb9c54e68ae44aa780c5c282a184.tar.gz | |
avcodec/lpc: Avoid floating point division by 0
Fixes: Ticket7996
Fixes: CVE-2020-20445
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/lpc.c | 2 | ||||
| -rw-r--r-- | libavcodec/lpc.h | 4 |
2 files changed, 3 insertions, 3 deletions
diff --git a/libavcodec/lpc.c b/libavcodec/lpc.c index 1d1d04fd80..3ed61563ee 100644 --- a/libavcodec/lpc.c +++ b/libavcodec/lpc.c @@ -189,7 +189,7 @@ double ff_lpc_calc_ref_coefs_f(LPCContext *s, const float *samples, int len, compute_ref_coefs(autoc, order, ref, error); for (i = 0; i < order; i++) avg_err = (avg_err + error[i])/2.0f; - return signal/avg_err; + return avg_err ? signal/avg_err : NAN; } /** diff --git a/libavcodec/lpc.h b/libavcodec/lpc.h index 88ca247f87..52170fd623 100644 --- a/libavcodec/lpc.h +++ b/libavcodec/lpc.h @@ -143,7 +143,7 @@ static inline void compute_ref_coefs(const LPC_TYPE *autoc, int max_order, gen0[i] = gen1[i] = autoc[i + 1]; err = autoc[0]; - ref[0] = -gen1[0] / err; + ref[0] = -gen1[0] / ((USE_FIXED || err) ? err : 1); err += gen1[0] * ref[0]; if (error) error[0] = err; @@ -152,7 +152,7 @@ static inline void compute_ref_coefs(const LPC_TYPE *autoc, int max_order, gen1[j] = gen1[j + 1] + ref[i - 1] * gen0[j]; gen0[j] = gen1[j + 1] * ref[i - 1] + gen0[j]; } - ref[i] = -gen1[0] / err; + ref[i] = -gen1[0] / ((USE_FIXED || err) ? err : 1); err += gen1[0] * ref[i]; if (error) error[i] = err; |