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avcodec/smc: Check remaining input

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Fixes: Timeout
Fixes: 1818/clusterfuzz-testcase-minimized-5039166473633792

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 356194fcb1)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-05-25 20:07:49 +02:00
parent 345f296135
commit 5529a67817
1 changed files with 4 additions and 0 deletions
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4
libavcodec/smc.c
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@ -132,6 +132,10 @@ static void smc_decode_stream(SmcContext *s)
row_ptr, image_size); row_ptr, image_size);
return; return;
} }
if (bytestream2_get_bytes_left(&s->gb) < 1) {
av_log(s->avctx, AV_LOG_ERROR, "input too small\n");
return;
}
opcode = bytestream2_get_byte(&s->gb); opcode = bytestream2_get_byte(&s->gb);
switch (opcode & 0xF0) { switch (opcode & 0xF0) {