Fixes: Ticket7996
Fixes: CVE-2020-20445
Signed-off-by: Michael Niedermayer <[email protected]>
---
libavcodec/lpc.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
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;
--
2.17.1
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