From cfd8e6ef491a7a5ff900ba2ba3deff7d0bebb0a6 Mon Sep 17 00:00:00 2001
From: Andreas Gruenbacher <agruenba@redhat.com>
Date: Fri, 15 Sep 2017 15:47:07 +0200
Subject: attr: Fix segmentation fault

When the -V option is used without -s, attr will cause a segmentation
fault instead of reporting an error:

  $ touch somefile
  $ attr -V whatever somefile
  Segmentation fault (core dumped)

https://savannah.nongnu.org/bugs/?48244
---
 tools/attr.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/attr.c b/tools/attr.c
index d68a62c..c8aa0b4 100644
--- a/tools/attr.c
+++ b/tools/attr.c
@@ -157,6 +157,10 @@ main(int argc, char **argv)
 	 */
 	switch (opflag) {
 	case SETOP:
+		if (!attrname) {
+		  fprintf(stderr, _("-V only allowed with -s\n"));
+		  usage();
+		}
 		if (attrvalue == NULL) {
 			attrvalue = malloc(ATTR_MAX_VALUELEN);
 			if (attrvalue == NULL) {
-- 
cgit v1.2.1