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authorGravatar Denys Vlasenko <vda.linux@googlemail.com>2011-03-08 12:44:02 +0100
committerGravatar Denys Vlasenko <vda.linux@googlemail.com>2011-03-08 12:44:02 +0100
commit86cf0364bd58e07646a23a1128e4a9ea79189579 (patch)
tree22e161a76936796b5f8d49536684d371e7e8bfc3 /coreutils/printenv.c
parent6b6af53426d98ab513972bd710f250e246e7fc98 (diff)
downloadbusybox-86cf0364bd58e07646a23a1128e4a9ea79189579.tar.gz
busybox-86cf0364bd58e07646a23a1128e4a9ea79189579.tar.bz2
printenv: fix environ == NULL segfault
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'coreutils/printenv.c')
-rw-r--r--coreutils/printenv.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/coreutils/printenv.c b/coreutils/printenv.c
index 33be5c096..d0fb71636 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;