linux-kernel - [PATCH 3.12 221/235] apparmor: fix arg_size computation for when setprocattr is null terminated

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Date:   Fri, 27 Jan 2017 11:55:54 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        John Johansen <john.johansen@...onical.com>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 221/235] apparmor: fix arg_size computation for when setprocattr is null terminated

From: John Johansen <john.johansen@...onical.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit d4d03f74a73f3b8b2801d4d02011b6b69778cbcc upstream.

Signed-off-by: John Johansen <john.johansen@...onical.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 security/apparmor/lsm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index 90905af74a8d..c623e4744f55 100644
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -562,7 +562,7 @@ static int apparmor_setprocattr(struct task_struct *task, char *name,
 	if (!*args)
 		goto out;
 
-	arg_size = size - (args - (char *) value);
+	arg_size = size - (args - (largs ? largs : (char *) value));
 	if (strcmp(name, "current") == 0) {
 		if (strcmp(command, "changehat") == 0) {
 			error = aa_setprocattr_changehat(args, arg_size,
-- 
2.11.0