[FFmpeg-cvslog] jpeglsdec: fix infinite loop

[Michael Niedermayer]

ffmpeg | branch: release/0.8 | Michael Niedermayer <michaelni at gmx.at> | Thu Sep  8 05:05:11 2011 +0200| [d99613bad60cd2640d15725581ef8fe14d9a6258] | committer: Michael Niedermayer

jpeglsdec: fix infinite loop
Fixes Ticket331

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
(cherry picked from commit bd358e128f47c14c7bc9dfceb8dedb3e5697f017)

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=d99613bad60cd2640d15725581ef8fe14d9a6258
---

 libavcodec/jpegls.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/libavcodec/jpegls.h b/libavcodec/jpegls.h
index 28c7524..2c21f77 100644
--- a/libavcodec/jpegls.h
+++ b/libavcodec/jpegls.h
@@ -86,6 +86,8 @@ static inline void ff_jpegls_downscale_state(JLSState *state, int Q){
 }
 
 static inline int ff_jpegls_update_state_regular(JLSState *state, int Q, int err){
+    if(FFABS(err) > 0xFFFF)
+        return -0x10000;
     state->A[Q] += FFABS(err);
     err *= state->twonear;
     state->B[Q] += err;