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avcodec/dxv: Correct integer overflow in get_opcodes()

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Fixes: 13099/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DXV_fuzzer-5665598896340992
Fixes: signed integer overflow: 2147483647 + 7 cannot be represented in type 'int'

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 6e0b5d3a20)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-03-03 00:47:47 +01:00
parent 67d030787e
commit ad12d9df1e
1 changed files with 2 additions and 1 deletions
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libavcodec/dxv.c
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@ -426,7 +426,8 @@ static int fill_optable(unsigned *table0, OpcodeTable *table1, int nb_elements)
static int get_opcodes(GetByteContext *gb, uint32_t *table, uint8_t *dst, int op_size, int nb_elements)
{
OpcodeTable optable[1024];
int sum, x, val, lshift, rshift, ret, size_in_bits, i, idx;
int sum, x, val, lshift, rshift, ret, i, idx;
int64_t size_in_bits;
unsigned endoffset, newoffset, offset;
unsigned next;
uint8_t *src = (uint8_t *)gb->buffer;