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avcodec/aacenc: Avoid 0 lambda

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Fixes: Ticket8003
Fixes: CVE-2020-20453

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit a7a7f32c8a)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-05-28 21:37:26 +02:00
parent 892f0ac5b2
commit e431babf71
1 changed files with 2 additions and 1 deletions
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3
libavcodec/aacenc.c
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@ -28,6 +28,7 @@
* TODOs:
* add sane pulse detection
***********************************/
#include <float.h>
#include "libavutil/libm.h"
#include "libavutil/thread.h"
@ -855,7 +856,7 @@ static int aac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
/* Not so fast though */
ratio = sqrtf(ratio);
}
s->lambda = FFMIN(s->lambda * ratio, 65536.f);
s->lambda = av_clipf(s->lambda * ratio, FLT_MIN, 65536.f);
/* Keep iterating if we must reduce and lambda is in the sky */
if (ratio > 0.9f && ratio < 1.1f) {