Commit 82d70d80 authored by Andreas Rheinhardt's avatar Andreas Rheinhardt

avcodec/hevc_mp4toannexb_bsf: Check NAL size against available input

The hevc_mp4toannexb bsf does not explicitly check whether a NAL unit
is so big that it extends beyond the end of the input packet; it does so
only implicitly by using the checked version of the bytestream2 API.
But this has downsides compared to real checks: It can lead to huge
allocations (up to 2GiB) even when the input packet is just a few bytes.
And furthermore it leads to uninitialized data being output.
So add a check to error out early if it happens.

Also check directly whether there is enough data for the length field.
Reviewed-by: 's avatarMichael Niedermayer <michael@niedermayer.cc>
Signed-off-by: 's avatarAndreas Rheinhardt <andreas.rheinhardt@gmail.com>
(cherry picked from commit ea1b71e82f5a1752d59d3bfb9704092a79eba6b5)
parent cc948a1c
......@@ -142,10 +142,14 @@ static int hevc_mp4toannexb_filter(AVBSFContext *ctx, AVPacket *out)
int nalu_type;
int is_irap, add_extradata, extra_size, prev_size;
if (bytestream2_get_bytes_left(&gb) < s->length_size) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
for (i = 0; i < s->length_size; i++)
nalu_size = (nalu_size << 8) | bytestream2_get_byte(&gb);
if (nalu_size < 2) {
if (nalu_size < 2 || nalu_size > bytestream2_get_bytes_left(&gb)) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
......
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