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avcodec/agm: Fix overflow of signed shift

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Fixes: left shift of 1 by 31 places cannot be represented in type 'int'
Fixes: 15328/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AGM_fuzzer-5637545171353600

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 2019-06-30 19:45:29 +02:00
parent 7d3581e6bb
commit 6ebbfb377f
1 changed files with 1 additions and 1 deletions
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libavcodec/agm.c
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@ -918,7 +918,7 @@ static void get_tree_codes(uint32_t *codes, Node *nodes, int idx, uint32_t pfx,
codes[idx] = pfx;
} else if (idx >= 0) {
get_tree_codes(codes, nodes, nodes[idx].child[0], pfx + (0 << bitpos), bitpos + 1);
get_tree_codes(codes, nodes, nodes[idx].child[1], pfx + (1 << bitpos), bitpos + 1);
get_tree_codes(codes, nodes, nodes[idx].child[1], pfx + (1U << bitpos), bitpos + 1);
}
}