[FFmpeg-cvslog] avcodec/dirac_parser: Add basic validity checks for next_pu_offset and prev_pu_offset

[Michael Niedermayer]

ffmpeg | branch: release/2.7 | Michael Niedermayer <michael at niedermayer.cc> | Sat Dec  5 17:14:36 2015 +0100| [ece3912daf656651b092f2362f62203594418a3a] | committer: Michael Niedermayer

avcodec/dirac_parser: Add basic validity checks for next_pu_offset and prev_pu_offset

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit c7d6ec947c053699950af90f695413a5640b3872)

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

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=ece3912daf656651b092f2362f62203594418a3a
---

 libavcodec/dirac_parser.c |    9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/libavcodec/dirac_parser.c b/libavcodec/dirac_parser.c
index 12f1a60..c7c4b69 100644
--- a/libavcodec/dirac_parser.c
+++ b/libavcodec/dirac_parser.c
@@ -114,6 +114,15 @@ static int unpack_parse_unit(DiracParseUnit *pu, DiracParseContext *pc,
     if (pu->pu_type == 0x10 && pu->next_pu_offset == 0)
         pu->next_pu_offset = 13;
 
+    if (pu->next_pu_offset && pu->next_pu_offset < 13) {
+        av_log(NULL, AV_LOG_ERROR, "next_pu_offset %d is invalid\n", pu->next_pu_offset);
+        return 0;
+    }
+    if (pu->prev_pu_offset && pu->prev_pu_offset < 13) {
+        av_log(NULL, AV_LOG_ERROR, "prev_pu_offset %d is invalid\n", pu->prev_pu_offset);
+        return 0;
+    }
+
     return 1;
 }