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avcodec/lzw: Check for end of input 

Fixes: Timeout
Fixes: 11873/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TIFF_fuzzer-5093495044308992

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 2019-01-11 22:38:35 +01:00
parent 70c68e654d
commit 19dc5cdaa7
1 changed files with 3 additions and 0 deletions
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3
libavcodec/lzw.c
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@ -71,6 +71,9 @@ static int lzw_get_code(struct LZWState * s)
{
int c;
if (s->bbits < s->cursize && bytestream2_get_bytes_left(&s->gb) <= 0)
return s->end_code;
if(s->mode == FF_LZW_GIF) {
while (s->bbits < s->cursize) {
if (!s->bs) {