[patch] sed: segfault due to use of initialized variable

[Sébastien Marie]

Hi,

Fuzzing sed with afl, I found a crash due to use of uninitialized
variable.

In process.c oldpsl variable need to be initialized:

$ echo | sed -e 'g;P'
Segmentation fault (core dumped)

The following patch correct this.

I also include the initialization of p, as it is reported by compiler
warning too (with -Wall -O2).

Thanks.
-- 
Sébastien Marie

Index: process.c
===================================================================
RCS file: /cvs/src/usr.bin/sed/process.c,v
retrieving revision 1.20
diff -u -p -r1.20 process.c
--- process.c   1 Dec 2014 06:37:25 -0000       1.20
+++ process.c   10 Dec 2014 09:15:15 -0000
@@ -83,8 +83,8 @@ process(void)
 {
        struct s_command *cp;
        SPACE tspace;
-       size_t len, oldpsl;
-       char *p;
+       size_t len, oldpsl = 0;
+       char *p = NULL;
 
        for (linenum = 0; mf_fgets(&PS, REPLACE);) {