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| author | Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com> | 2015-12-19 12:02:56 +0100 |
|---|---|---|
| committer | Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com> | 2015-12-20 14:17:59 +0100 |
| commit | 1dc135e03d83d14274e3049011396a5bcb36e464 (patch) | |
| tree | 67c347d98c1b56559f9ce0f7365f55b933ee89bd | |
| parent | f040f3e5d5abfe4f59036e7b671d7b03eda244e7 (diff) | |
| download | ffmpeg-1dc135e03d83d14274e3049011396a5bcb36e464.tar.gz | |
nutdec: reject negative value_len in read_sm_data
If it is negative, it can cause the byte position to move backwards in
avio_skip, which in turn makes sm_size negative and thus size larger
than the size of the packet buffer, causing invalid writes in avio_read.
Also fix potential overflow of avio_tell(bc) + value_len.
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
(cherry picked from commit ce10f572c12b0d172c72d31d8c979afce602bf0c)
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
| -rw-r--r-- | libavformat/nutdec.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/libavformat/nutdec.c b/libavformat/nutdec.c index 41c9689f50..2be52e4426 100644 --- a/libavformat/nutdec.c +++ b/libavformat/nutdec.c @@ -927,7 +927,7 @@ static int read_sm_data(AVFormatContext *s, AVIOContext *bc, AVPacket *pkt, int return ret; } value_len = ffio_read_varlen(bc); - if (avio_tell(bc) + value_len >= maxpos) + if (value_len < 0 || value_len >= maxpos - avio_tell(bc)) return AVERROR_INVALIDDATA; if (!strcmp(name, "Palette")) { dst = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, value_len); |