From: tang.junhui <tang.junhui@zte.com.cn>
Date: Fri, 28 Oct 2016 09:04:46 +0000 (+0800)
Subject: dm mpath: add m->hw_handler_name NULL pointer check in parse_hw_handler()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=f97dc421280e16b8eb0c8f685610ba007ec11b79;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

dm mpath: add m->hw_handler_name NULL pointer check in parse_hw_handler()

Avoids false positive of no hardware handler being specified (which is
implied by a NULL m->hw_handler_name).

Signed-off-by: tang.junhui <tang.junhui@zte.com.cn>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
---

diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index e477af8596e2..d234b6c33646 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -1002,6 +1002,8 @@ static int parse_hw_handler(struct dm_arg_set *as, struct multipath *m)
 	}
 
 	m->hw_handler_name = kstrdup(dm_shift_arg(as), GFP_KERNEL);
+	if (!m->hw_handler_name)
+		return -EINVAL;
 
 	if (hw_argc > 1) {
 		char *p;