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avcodec/hevc_mp4toannexb: more validations for nalu_len

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For a corrupted stream, the value of nalu_len read from the extradata is not reliable.
We need to perform additional checks
This commit is contained in:
Nuo Mi 2024-02-09 19:16:31 +08:00
parent f7a504a0df
commit 4f80441455
1 changed files with 4 additions and 2 deletions
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6
libavcodec/bsf/hevc_mp4toannexb.c
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@ -65,9 +65,11 @@ static int hevc_extradata_to_annexb(AVBSFContext *ctx)
}
for (j = 0; j < cnt; j++) {
int nalu_len = bytestream2_get_be16(&gb);
const int nalu_len = bytestream2_get_be16(&gb);
if (4 + AV_INPUT_BUFFER_PADDING_SIZE + nalu_len > SIZE_MAX - new_extradata_size) {
if (!nalu_len ||
nalu_len > bytestream2_get_bytes_left(&gb) ||
4 + AV_INPUT_BUFFER_PADDING_SIZE + nalu_len > SIZE_MAX - new_extradata_size) {
ret = AVERROR_INVALIDDATA;
goto fail;
}