[git commit master 1/1] printenv: fix environ == NULL segfault

[Denys Vlasenko]

commit: http://git.busybox.net/busybox/commit/?id=86cf0364bd58e07646a23a1128e4a9ea79189579
branch: http://git.busybox.net/busybox/commit/?id=refs/heads/master

Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
---
 coreutils/printenv.c |   11 ++++++++---
 coreutils/test.c     |    2 +-
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/coreutils/printenv.c b/coreutils/printenv.c
index 33be5c0..d0fb716 100644
--- a/coreutils/printenv.c
+++ b/coreutils/printenv.c
@@ -19,9 +19,14 @@ int printenv_main(int argc UNUSED_PARAM, char **argv)
 
 	/* no variables specified, show whole env */
 	if (!argv[1]) {
-		int e = 0;
-		while (environ[e])
-			puts(environ[e++]);
+		char **e = environ;
+
+		/* environ can be NULL! (for example, after clearenv())
+		 * Check for that:
+		 */
+		if (e)
+			while (*e)
+				puts(*e++);
 	} else {
 		/* search for specified variables and print them out if found */
 		char *arg, *env;
diff --git a/coreutils/test.c b/coreutils/test.c
index 8248a1e..2d245be 100644
--- a/coreutils/test.c
+++ b/coreutils/test.c
@@ -45,7 +45,7 @@
 /* This is a NOFORK applet. Be very careful! */
 
 /* test_main() is called from shells, and we need to be extra careful here.
- * This is true regardless of PREFER_APPLETS and STANDALONE_SHELL
+ * This is true regardless of PREFER_APPLETS and SH_STANDALONE
  * state. */
 
 /* test(1) accepts the following grammar:
-- 
1.7.3.4