[FFmpeg-cvslog] avcodec/svq1dec: zero terminate embedded message before printing

[Michael Niedermayer]

ffmpeg | branch: release/2.3 | Michael Niedermayer <michaelni at gmx.at> | Thu Oct 30 18:16:25 2014 +0100| [9395a3a96bf82038d0cad65b7fb4b9d873836ae7] | committer: Michael Niedermayer

avcodec/svq1dec: zero terminate embedded message before printing

Fixes out of array access
Fixes: asan_stack-oob_49b1e5_10_009.mov
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
(cherry picked from commit e91ba2efa949470e9157b652535d207a101f91e0)

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=9395a3a96bf82038d0cad65b7fb4b9d873836ae7
---

 libavcodec/svq1dec.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/libavcodec/svq1dec.c b/libavcodec/svq1dec.c
index 1e7ab49..8ac7885 100644
--- a/libavcodec/svq1dec.c
+++ b/libavcodec/svq1dec.c
@@ -495,7 +495,7 @@ static int svq1_decode_delta_block(AVCodecContext *avctx, HpelDSPContext *hdsp,
     return result;
 }
 
-static void svq1_parse_string(GetBitContext *bitbuf, uint8_t *out)
+static void svq1_parse_string(GetBitContext *bitbuf, uint8_t out[257])
 {
     uint8_t seed;
     int i;
@@ -507,6 +507,7 @@ static void svq1_parse_string(GetBitContext *bitbuf, uint8_t *out)
         out[i] = get_bits(bitbuf, 8) ^ seed;
         seed   = string_table[out[i] ^ seed];
     }
+    out[i] = 0;
 }
 
 static int svq1_decode_frame_header(AVCodecContext *avctx, AVFrame *frame)
@@ -549,12 +550,12 @@ static int svq1_decode_frame_header(AVCodecContext *avctx, AVFrame *frame)
         }
 
         if ((s->frame_code ^ 0x10) >= 0x50) {
-            uint8_t msg[256];
+            uint8_t msg[257];
 
             svq1_parse_string(bitbuf, msg);
 
             av_log(avctx, AV_LOG_INFO,
-                   "embedded message:\n%s\n", (char *)msg);
+                   "embedded message:\n%s\n", ((char *)msg) + 1);
         }
 
         skip_bits(bitbuf, 2);