UBI: bugfix: dont oops with NULL module parameter

E.g., it oopsed in case of: modprobe ubi mtd = 0

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index 9b94427..b85ca18 100644 (file)
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -845,6 +845,9 @@ static int __init ubi_mtd_param_parse(const char *val, struct kernel_param *kp)
        char *pbuf = &buf[0];
        char *tokens[3] = {NULL, NULL, NULL};
 
+       if (!val)
+               return -EINVAL;
+
        if (mtd_devs == UBI_MAX_DEVICES) {
                printk("UBI error: too many parameters, max. is %d\n",
                       UBI_MAX_DEVICES);