[FFmpeg-cvslog] avcodec/microdvddec: Check for string end in 'P' case

[Michael Niedermayer]

ffmpeg | branch: release/2.5 | Michael Niedermayer <michael at niedermayer.cc> | Fri Nov  6 22:24:23 2015 +0100| [5bb599d0c013cfdb9d8ac84b34df87fe91048dd2] | committer: Michael Niedermayer

avcodec/microdvddec: Check for string end in 'P' case

Fixes out of array read
Fixes: a9502b60f4cecc19475382aee255f73c/asan_heap-oob_1e87fba_2548_a8ad47f6dde36644fe9cdc444d4632d0.sub

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit c719cd6cf79ec21d974b81ba874580f4b8e9eb90)

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

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=5bb599d0c013cfdb9d8ac84b34df87fe91048dd2
---

 libavcodec/microdvddec.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/microdvddec.c b/libavcodec/microdvddec.c
index 96034a0..9035892 100644
--- a/libavcodec/microdvddec.c
+++ b/libavcodec/microdvddec.c
@@ -164,6 +164,8 @@ static char *microdvd_load_tags(struct microdvd_tag *tags, char *s)
 
         /* Position */
         case 'P':
+            if (!*s)
+                break;
             tag.persistent = MICRODVD_PERSISTENT_ON;
             tag.data1 = (*s++ == '1');
             if (*s != '}')