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avcodec/exr: Check for remaining bits in huf_unpack_enc_table()

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Fixes: Timeout
Fixes: 67645/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_EXR_fuzzer-6308760977997824

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 589fa8a027)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2024-04-01 02:15:07 +02:00
parent 808ec6ccfa
commit b9b1bd6225
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1 changed files with 4 additions and 1 deletions
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5
libavcodec/exr.c
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@ -334,7 +334,10 @@ static int huf_unpack_enc_table(GetByteContext *gb,
return ret;
for (; im <= iM; im++) {
uint64_t l = freq[im] = get_bits(&gbit, 6);
uint64_t l;
if (get_bits_left(&gbit) < 6)
return AVERROR_INVALIDDATA;
l = freq[im] = get_bits(&gbit, 6);
if (l == LONG_ZEROCODE_RUN) {
int zerun = get_bits(&gbit, 8) + SHORTEST_LONG_RUN;