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avcodec/exr: Check remaining bits in last get code loop

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Fixes: runtime error: shift exponent -7 is negative
Fixes: 3902/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_EXR_fuzzer-6081926122176512

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 dd8351b118)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-02-14 13:01:46 +01:00
parent a3c66132d9
commit 09dad52390
1 changed files with 1 additions and 1 deletions
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2
libavcodec/exr.c
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@ -537,7 +537,7 @@ static int huf_decode(const uint64_t *hcode, const HufDec *hdecod,
while (lc > 0) {
const HufDec pl = hdecod[(c << (HUF_DECBITS - lc)) & HUF_DECMASK];
if (pl.len) {
if (pl.len && lc >= pl.len) {
lc -= pl.len;
get_code(pl.lit, rlc, c, lc, gb, out, oe, outb);
} else {