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avcodec/sanm: Optimize fill_frame() with av_memcpy_backptr() 

Fixes: Timeout (76 sec -> 24 sec)
Fixes: 15043/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SANM_fuzzer-5699856238116864

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-06-28 20:38:56 +02:00
parent e69106e70c
commit 936ca7f101
1 changed files with 3 additions and 1 deletions
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4
libavcodec/sanm.c
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@ -1358,8 +1358,10 @@ static int read_frame_header(SANMVideoContext *ctx, SANMFrameHeader *hdr)
static void fill_frame(uint16_t *pbuf, int buf_size, uint16_t color)
{
while (buf_size--)
if (buf_size--) {
*pbuf++ = color;
av_memcpy_backptr((uint8_t*)pbuf, 2, 2*buf_size);
}
}
static int copy_output(SANMVideoContext *ctx, SANMFrameHeader *hdr)