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avcodec/pnm_parser: Use memchr() in pnm_parse()

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Fixes: Timeout (45sec -> 0.5sec)
Fixes: 16942/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PPM_fuzzer-5085393073995776

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-09-10 00:04:08 +02:00
parent b794df43f3
commit 10ea6c3116
1 changed files with 5 additions and 2 deletions
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7
libavcodec/pnm_parser.c
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@ -95,8 +95,11 @@ retry:
sync = bs;
c = *bs++;
if (c == '#') {
while (c != '\n' && bs < end)
c = *bs++;
uint8_t *match = memchr(bs, '\n', end-bs);
if (match)
bs = match + 1;
else
break;
} else if (c == 'P') {
next = bs - pnmctx.bytestream_start + skip - 1;
pnmpc->ascii_scan = 0;