[PATCH] fs: smb: client: Add missing check for kstrdup()

[Haoxiang Li]

Add check for kstrdup() in smb3_reconfigure in order to guarantee
the success of allocation.

Fixes: c1eb537bf456 ("cifs: allow changing password during remount")
Signed-off-by: Haoxiang Li <make24@xxxxxxxxxxx>
---
 fs/smb/client/fs_context.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/smb/client/fs_context.c b/fs/smb/client/fs_context.c
index 3bbac925d076..8253b615b8ce 100644
--- a/fs/smb/client/fs_context.c
+++ b/fs/smb/client/fs_context.c
@@ -920,6 +920,8 @@ static int smb3_reconfigure(struct fs_context *fc)
 		ses->password = kstrdup(ctx->password, GFP_KERNEL);
 		kfree_sensitive(ses->password2);
 		ses->password2 = kstrdup(ctx->password2, GFP_KERNEL);
+		if (!ses->password || !ses->password2)
+			return ERR_PTR(rc);
 	}
 	STEAL_STRING(cifs_sb, ctx, domainname);
 	STEAL_STRING(cifs_sb, ctx, nodename);
-- 
2.25.1