ARM: S3C: NAND: Check the existence of nr_map before copying

Since the structure field nr_map is optional, we need to check whether the
chip number map is provided to avoid unexpected NULL pointer exception.

Signed-off-by: Ramax Lo <ramaxlo@gmail.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/arm/plat-s3c/dev-nand.c b/arch/arm/plat-s3c/dev-nand.c
index 84808ccda70e..a52fb6cf618f 100644
--- a/arch/arm/plat-s3c/dev-nand.c
+++ b/arch/arm/plat-s3c/dev-nand.c
@@ -58,8 +58,8 @@ static int __init s3c_nand_copy_set(struct s3c2410_nand_set *set)
                         return -ENOMEM;
         }
         
-        size = sizeof(int) * set->nr_chips;
-        if (size) {
+        if (set->nr_map && set->nr_chips) {
+                size = sizeof(int) * set->nr_chips;
                 ptr = kmemdup(set->nr_map, size, GFP_KERNEL);
                 set->nr_map = ptr;