powerpc/vio: use strcpy in modalias_show

commit 411cabf79e684171669ad29a0628c400b4431e95 upstream.

Commit e82b89a6f19bae73fb064d1b3dd91fcefbb478f4 used strcat instead of
strcpy which can result in an overflow of newlines on the buffer.

Signed-off-by: Prarit Bhargava
Cc: benh@kernel.crashing.org
Cc: ben@decadent.org.uk
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/powerpc/kernel/vio.c b/arch/powerpc/kernel/vio.c
index 2d845d8199fc..56d2e72c85de 100644
--- a/arch/powerpc/kernel/vio.c
+++ b/arch/powerpc/kernel/vio.c
@@ -1530,12 +1530,12 @@ static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
 
         dn = dev->of_node;
         if (!dn) {
-                strcat(buf, "\n");
+                strcpy(buf, "\n");
                 return strlen(buf);
         }
         cp = of_get_property(dn, "compatible", NULL);
         if (!cp) {
-                strcat(buf, "\n");
+                strcpy(buf, "\n");
                 return strlen(buf);
         }