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avcodec/exr: increase vlc depth 

Fixes: shift exponent -4 is negative
Fixes: 32265/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_EXR_fuzzer-465133454137753

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 2021-04-11 21:17:50 +02:00
parent c093eb3031
commit 3344079d30
1 changed files with 1 additions and 1 deletions
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2
libavcodec/exr.c
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@ -418,7 +418,7 @@ static int huf_decode(VLC *vlc, GetByteContext *gb, int nbits, int run_sym,
init_get_bits(&gbit, gb->buffer, nbits);
while (get_bits_left(&gbit) > 0 && oe < no) {
uint16_t x = get_vlc2(&gbit, vlc->table, 12, 2);
uint16_t x = get_vlc2(&gbit, vlc->table, 12, 3);
if (x == run_sym) {
int run = get_bits(&gbit, 8);