[Ffmpeg-devel] [PATCH] fix jpegls unitialized data reading

[Reimar Döffinger]

Hello,
currently jpegls regression tests fail on some (e.g. my) systems.
The reason is that due to the stuffing code the encoder might read and
store uninitialized data.
Attached patch just initializes 16 additional bits.
Ok to apply?

Greetings,
Reimar D?ffinger
-------------- next part --------------
Index: libavcodec/jpeg_ls.c
===================================================================
--- libavcodec/jpeg_ls.c	(revision 7265)
+++ libavcodec/jpeg_ls.c	(working copy)
@@ -804,9 +804,10 @@
     av_free(zero);
     av_free(state);
 
+    put_bits(&pb2, 16, 0);
     flush_put_bits(&pb2);
     /* do escape coding */
-    size = put_bits_count(&pb2) >> 3;
+    size = (put_bits_count(&pb2) >> 3) - 2;
     init_get_bits(&gb, buf2, size);
     while(get_bits_count(&gb) < size * 8){
         int v;