[FFmpeg-cvslog] avcodec/jpeglsdec: Increase range for N in ls_get_code_runterm() by using unsigned

[Michael Niedermayer]

ffmpeg | branch: release/4.2 | Michael Niedermayer <michael at niedermayer.cc> | Sat Feb  5 20:41:08 2022 +0100| [e13aba00237b42be3b99f0a638a0b8fc37d22e0b] | committer: Michael Niedermayer

avcodec/jpeglsdec: Increase range for N in ls_get_code_runterm() by using unsigned

Fixes: left shift of 32768 by 16 places cannot be represented in type 'int'
Fixes: Timeout
Fixes: 44219/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SMVJPEG_fuzzer-4679455379947520
Fixes: 44088/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SMVJPEG_fuzzer-4885976600674304

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 6ee283d7d001cfcfec94a023e172bca731e96514)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=e13aba00237b42be3b99f0a638a0b8fc37d22e0b
---

 libavcodec/jpeglsdec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/jpeglsdec.c b/libavcodec/jpeglsdec.c
index a8d9eaa18a..0cb40cc0f1 100644
--- a/libavcodec/jpeglsdec.c
+++ b/libavcodec/jpeglsdec.c
@@ -186,7 +186,7 @@ static inline int ls_get_code_runterm(GetBitContext *gb, JLSState *state,
     if (RItype)
         temp += state->N[Q] >> 1;
 
-    for (k = 0; (state->N[Q] << k) < temp; k++)
+    for (k = 0; ((unsigned)state->N[Q] << k) < temp; k++)
         ;
 
 #ifdef JLS_BROKEN