From: zhangxiliang <zhangxiliang@cn.fujitsu.com>
Date: Fri, 1 Aug 2008 11:15:47 +0000 (+0800)
Subject: [PATCH] Fix the kernel panic of audit_filter_task when key field is set
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=980dfb0db340b95094732d78b55311f2c539c1af;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

[PATCH] Fix the kernel panic of audit_filter_task when key field is set

When calling audit_filter_task(), it calls audit_filter_rules() with audit_context is NULL.
If the key field is set, the result in audit_filter_rules() will be set to 1 and
ctx->filterkey will be set to key.
But the ctx is NULL in this condition, so kernel will panic.

Signed-off-by: Zhang Xiliang <zhangxiliang@cn.fujitsu.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 580a5389fd99..496c3dd37276 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -610,7 +610,7 @@ static int audit_filter_rules(struct task_struct *tsk,
 		if (!result)
 			return 0;
 	}
-	if (rule->filterkey)
+	if (rule->filterkey && ctx)
 		ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC);
 	switch (rule->action) {
 	case AUDIT_NEVER:    *state = AUDIT_DISABLED;	    break;