[FFmpeg-devel] [PATCH 13/22] avformat/siff: Basic pkt_size check

[Michael Niedermayer]

Fixes: half of CID1258461 Overflowed constant

Sponsored-by: Sovereign Tech Fund
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
 libavformat/siff.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/libavformat/siff.c b/libavformat/siff.c
index 5aad03d870f..b33746d51d2 100644
--- a/libavformat/siff.c
+++ b/libavformat/siff.c
@@ -199,7 +199,10 @@ static int siff_read_packet(AVFormatContext *s, AVPacket *pkt)
         if (c->cur_frame >= c->frames)
             return AVERROR_EOF;
         if (c->curstrm == -1) {
-            c->pktsize = avio_rl32(s->pb) - 4;
+            unsigned pktsize = avio_rl32(s->pb);
+            if (pktsize < 4)
+                return AVERROR_INVALIDDATA;
+            c->pktsize = pktsize - 4;
             c->flags   = avio_rl16(s->pb);
             if (c->flags & VB_HAS_AUDIO && !c->has_audio)
                 return AVERROR_INVALIDDATA;
-- 
2.45.2