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avcodec/ac3_parser: use a padded buffer in av_ac3_parse_header()

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The GetBitContext API requires the buffer to be padded, and the documentation for
av_ac3_parse_header() does not specify it, so use a temporary local buffer.

Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer
2025-06-05 21:07:14 -03:00
parent 49e52ca24f
commit efbcd31206
1 changed files with 5 additions and 1 deletions
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6
libavcodec/ac3_parser.c
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@ -202,9 +202,13 @@ int av_ac3_parse_header(const uint8_t *buf, size_t size,
{ {
GetBitContext gb; GetBitContext gb;
AC3HeaderInfo hdr; AC3HeaderInfo hdr;
uint8_t tmp[32 + AV_INPUT_BUFFER_PADDING_SIZE];
int err; int err;
err = init_get_bits8(&gb, buf, size); size = FFMIN(32, size);
memcpy(tmp, buf, size);
memset(tmp + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
err = init_get_bits8(&gb, tmp, size);
if (err < 0) if (err < 0)
return AVERROR_INVALIDDATA; return AVERROR_INVALIDDATA;
err = ff_ac3_parse_header(&gb, &hdr); err = ff_ac3_parse_header(&gb, &hdr);