From: Konrad Lipinski <konrad.l@samsung.com>
Date: Wed, 12 Oct 2016 10:54:15 +0000 (+0200)
Subject: kdbus: cmdline emptiness check fix
X-Git-Tag: submit/tizen_3.0/20161102.035825^0
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d228dee53e858e5e924c8d4d4fd9c1394210e2be;p=platform%2Fkernel%2Flinux-exynos.git

kdbus: cmdline emptiness check fix

[ This commit re-applies change Ia925fa43bf4c50ab707be98f275b50808782f063 to new kdbus upstream version. ]
Signed-off-by: Karol Lewandowski <k.lewandowsk@samsung.com>

Change-Id: Ia03913a35dba34567c1bd99afbfe138ea7a5d133
---

diff --git a/ipc/kdbus/metadata.c b/ipc/kdbus/metadata.c
index 71ca475a80d5..106ec26f2882 100644
--- a/ipc/kdbus/metadata.c
+++ b/ipc/kdbus/metadata.c
@@ -244,7 +244,7 @@ static int kdbus_meta_proc_collect_cmdline(struct kdbus_meta_proc *mp)
 	struct mm_struct *mm = current->mm;
 	char *cmdline;
 
-	if (!mm->arg_end)
+	if (mm->arg_start >= mm->arg_end)
 		return 0;
 
 	cmdline = strndup_user((const char __user *)mm->arg_start,