From: Pádraig Brady <P@draigBrady.com>
Date: Wed, 24 Jun 2015 18:14:47 +0000 (+0100)
Subject: maint: avoid undefined behavior in qsort call
X-Git-Tag: v8.24~22
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=77547ba7b26aa65fc0f6dfcc0cb8235686699611;p=thirdparty%2Fcoreutils.git

maint: avoid undefined behavior in qsort call

GCC 5.1.1 -fsanitize=undefined with glibc 2.21 is returning:
"runtime error: null pointer passed as argument 1,
 which is declared to never be null"
* src/ptx.c (sort_found_occurs): Avoid the call with no entries.
---

diff --git a/src/ptx.c b/src/ptx.c
index ff4e63a5fb..3aea4cdf26 100644
--- a/src/ptx.c
+++ b/src/ptx.c
@@ -631,9 +631,9 @@ sort_found_occurs (void)
 {
 
   /* Only one language for the time being.  */
-
-  qsort (occurs_table[0], number_of_occurs[0], sizeof **occurs_table,
-         compare_occurs);
+  if (number_of_occurs[0])
+    qsort (occurs_table[0], number_of_occurs[0], sizeof **occurs_table,
+           compare_occurs);
 }
 
 /* Parameter files reading routines.  */