linux-kernel - [PATCH] tomoyo: Avoid potential null pointer access

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Date:   Wed, 25 Nov 2020 20:10:43 +0800
From:   Zheng Zengkai <zhengzengkai@...wei.com>
To:     <takedakn@...data.co.jp>, <penguin-kernel@...ove.SAKURA.ne.jp>,
        <jmorris@...ei.org>, <serge@...lyn.com>
CC:     <linux-security-module@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <zhengzengkai@...wei.com>
Subject: [PATCH] tomoyo: Avoid potential null pointer access

Calls to kzalloc() should be null-checked in order to avoid
any potential failures or unnecessary code execution.
Fix this by adding null checks for _entry_ right after allocation.

Fixes: 57c2590fb7fd ("TOMOYO: Update profile structure")
Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@...wei.com>
---
 security/tomoyo/common.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/security/tomoyo/common.c b/security/tomoyo/common.c
index 4bee32bfe16d..99b4fafcb100 100644
--- a/security/tomoyo/common.c
+++ b/security/tomoyo/common.c
@@ -499,6 +499,8 @@ static struct tomoyo_profile *tomoyo_assign_profile
 	if (ptr)
 		return ptr;
 	entry = kzalloc(sizeof(*entry), GFP_NOFS);
+	if (!entry)
+		return NULL;
 	if (mutex_lock_interruptible(&tomoyo_policy_lock))
 		goto out;
 	ptr = ns->profile_ptr[profile];
-- 
2.20.1