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avcodec/ylc: Fix shift overflow 

Fixes: runtime error: shift exponent 32 is too large for 32-bit type 'unsigned int'
Fixes: 2698/clusterfuzz-testcase-minimized-4713541443518464

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 2017-07-22 02:57:12 +02:00
parent 0764fe1d09
commit 03a9e6ff30
1 changed files with 1 additions and 1 deletions
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libavcodec/ylc.c
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@ -69,7 +69,7 @@ static void get_tree_codes(uint32_t *bits, int16_t *lens, uint8_t *xlat,
s = nodes[node].sym;
if (s != -1) {
bits[*pos] = (~pfx) & ((1U << FFMAX(pl, 1)) - 1);
bits[*pos] = (~pfx) & ((1ULL << FFMAX(pl, 1)) - 1);
lens[*pos] = FFMAX(pl, 1);
xlat[*pos] = s + (pl == 0);
(*pos)++;