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avcodec/mpeg12dec: Fix uninitialized data in fate-sub-cc-scte20

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The issue is introduced in a705bcd763, please tested with below command line:
make V=1 fate-sub-cc-scte20 TARGET_EXEC="valgrind --error-exitcode=1"

Reported-by:   Martin Storsjö <martin@martin.st>
Reviewed-by:   Martin Storsjö <martin@martin.st>
Signed-off-by: Limin Wang <lance.lmwang@gmail.com>
This commit is contained in:
Limin Wang 2020-06-28 20:46:19 +08:00
parent 5005b41ad6
commit b6f505ce0a
1 changed files with 2 additions and 0 deletions
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2
libavcodec/mpeg12dec.c
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@ -2276,6 +2276,8 @@ static int mpeg_decode_a53_cc(AVCodecContext *avctx,
if (ret >= 0) {
uint8_t field, cc1, cc2;
uint8_t *cap = s1->a53_buf_ref->data;
memset(s1->a53_buf_ref->data + old_size, 0, cc_count * 3);
for (i = 0; i < cc_count && get_bits_left(&gb) >= 26; i++) {
skip_bits(&gb, 2); // priority
field = get_bits(&gb, 2);