Subject: [PATCH v2 4/5] powerpc/pseries: handle nodes without '/'

From: Andy Shevchenko <[email-masked]>
Date: Tue, 11 Aug 2015 14:23:08 +0300

In case we have node without '/' strrchr() returns NULL which might lead to
crash. Replace strrchr() by kbasename() and modify condition to avoid such
behaviour.

Suggested-by: Segher Boessenkool <[email-masked]>
Signed-off-by: Andy Shevchenko <[email-masked]>
---
 arch/powerpc/platforms/pseries/of_helpers.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/platforms/pseries/of_helpers.c b/arch/powerpc/platforms/pseries/of_helpers.c
index 8c6b05a..4417afe 100644
--- a/arch/powerpc/platforms/pseries/of_helpers.c
+++ b/arch/powerpc/platforms/pseries/of_helpers.c
@@ -17,14 +17,14 @@ struct device_node *pseries_of_derive_parent(const char *path)
 {
 	struct device_node *parent;
 	char *parent_path = "/";
-	size_t parent_path_len = strrchr(path, '/') - path + 1;
+	const char *tail = kbasename(path);
 
 	/* reject if path is "/" */
 	if (!strcmp(path, "/"))
 		return ERR_PTR(-EINVAL);
 
-	if (strrchr(path, '/') != path) {
-		parent_path = kstrndup(path, parent_path_len, GFP_KERNEL);
+	if (tail > path + 1) {
+		parent_path = kstrndup(path, tail - path, GFP_KERNEL);
 		if (!parent_path)
 			return ERR_PTR(-ENOMEM);
 	}
-- 
2.5.0