[FFmpeg-cvslog] avcodec/jpeglsdec: Check run value more completely in ls_decode_line()

[Michael Niedermayer]

ffmpeg | branch: release/2.4 | Michael Niedermayer <michaelni at gmx.at> | Thu Oct  2 23:17:21 2014 +0200| [b29f9897e329c70b430e3b527c82a2ddd2d08d88] | committer: Michael Niedermayer

avcodec/jpeglsdec: Check run value more completely in ls_decode_line()

previously it could have been by 1 too large
Fixes out of array access
Fixes: asan_heap-oob_12240f5_1_asan_heap-oob_12240f5_448_t8c1e3.jls
Fixes: asan_heap-oob_12240f5_1_asan_heap-oob_12240f5_448_t8nde0.jls
Fixes: asan_heap-oob_12240fa_1_asan_heap-oob_12240fa_448_t16e3.jls

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
(cherry picked from commit 06e7d58410a17dc72c30ee7f3145fcacc425f4f2)

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

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=b29f9897e329c70b430e3b527c82a2ddd2d08d88
---

 libavcodec/jpeglsdec.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavcodec/jpeglsdec.c b/libavcodec/jpeglsdec.c
index fb3762d..bb8c264 100644
--- a/libavcodec/jpeglsdec.c
+++ b/libavcodec/jpeglsdec.c
@@ -269,6 +269,11 @@ static inline void ls_decode_line(JLSState *state, MJpegDecodeContext *s,
                 x += stride;
             }
 
+            if (x >= w) {
+                av_log(NULL, AV_LOG_ERROR, "run overflow\n");
+                return;
+            }
+
             /* decode run termination value */
             Rb     = R(last, x);
             RItype = (FFABS(Ra - Rb) <= state->near) ? 1 : 0;