From: Konrad Lipinski <konrad.l@samsung.com>
Date: Wed, 12 Oct 2016 10:44:02 +0000 (+0200)
Subject: kdbus: cmdline emptiness condition fix
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=07edeeb6453f1aecc332681b1a04d158277653d9;p=platform%2Fkernel%2Flinux-exynos.git

kdbus: cmdline emptiness condition fix
---

diff --git a/ipc/kdbus/metadata.c b/ipc/kdbus/metadata.c
index 340918085d04..199c5fb192f9 100644
--- a/ipc/kdbus/metadata.c
+++ b/ipc/kdbus/metadata.c
@@ -399,9 +399,9 @@ int kdbus_meta_proc_collect(struct kdbus_meta_payload * __restrict__ * __restric
 	}
 	if (what & KDBUS_ATTACH_CMDLINE) {
 		struct mm_struct *mm = current->mm;
+		var(arg_start, mm->arg_start);
 		var(arg_end, mm->arg_end);
-		if (arg_end) {
-			var(arg_start, mm->arg_start);
+		if (arg_start < arg_end) {
 			var(len, strnlen_user((char const __user *)arg_start, arg_end - arg_start)); /* includes trailing \0 */
 			typeof(kdbus_meta_payload_tail_offset(pay)) tail_offset;
 			pay = *pptr;