From: Chet Ramey <chet.ramey@case.edu>
Date: Mon, 7 Nov 2022 16:41:10 +0000 (-0500)
Subject: Bash-5.2 patch 5: fix crash with null pattern substitution replacement string
X-Git-Tag: bash-5.3-alpha~24
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=7b9954e67aab9fed742becbfd77dcb1cbcf423bc;p=thirdparty%2Fbash.git

Bash-5.2 patch 5: fix crash with null pattern substitution replacement string
---

diff --git a/patchlevel.h b/patchlevel.h
index 16233d5a5..c2610416f 100644
--- a/patchlevel.h
+++ b/patchlevel.h
@@ -25,6 +25,6 @@
    regexp `^#define[ 	]*PATCHLEVEL', since that's what support/mkversion.sh
    looks for to find the patch level (for the sccs version string). */
 
-#define PATCHLEVEL 4
+#define PATCHLEVEL 5
 
 #endif /* _PATCHLEVEL_H_ */
diff --git a/subst.c b/subst.c
index 295d3aad5..b22fc64be 100644
--- a/subst.c
+++ b/subst.c
@@ -8965,7 +8965,8 @@ pat_subst (string, pat, rep, mflags)
       return (ret);
     }
   else if (*string == 0 && (match_pattern (string, pat, mtype, &s, &e) != 0))
-    return ((mflags & MATCH_EXPREP) ? strcreplace (rep, '&', "", 2) : savestring (rep));
+    return (mflags & MATCH_EXPREP) ? strcreplace (rep, '&', "", 2)
+				   : (rep ? savestring (rep) : savestring (""));
 
   ret = (char *)xmalloc (rsize = 64);
   ret[0] = '\0';