From: Michael Niedermayer <michael@niedermayer.cc>
Date: Thu, 6 Jun 2019 21:17:18 +0000 (+0200)
Subject: avformat/vpk: Check offset for validity
X-Git-Url: https://git.sesse.net/?a=commitdiff_plain;h=aa003019ab9ec5ef7e7b3ff9d6262d3472b427eb;p=ffmpeg

avformat/vpk: Check offset for validity

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---

diff --git a/libavformat/vpk.c b/libavformat/vpk.c
index dcc2db329c9..255d6030b0d 100644
--- a/libavformat/vpk.c
+++ b/libavformat/vpk.c
@@ -66,6 +66,9 @@ static int vpk_read_header(AVFormatContext *s)
         return AVERROR_INVALIDDATA;
     vpk->block_count       = (st->duration + (samples_per_block - 1)) / samples_per_block;
     vpk->last_block_size   = (st->duration % samples_per_block) * 16 * st->codecpar->channels / 28;
+
+    if (offset < avio_tell(s->pb))
+        return AVERROR_INVALIDDATA;
     avio_skip(s->pb, offset - avio_tell(s->pb));
     avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);