[PATCH] tomoyo: Avoid potential null pointer access

[Zheng Zengkai]

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@xxxxxxxxxx>
Signed-off-by: Zheng Zengkai <zhengzengkai@xxxxxxxxxx>
---
 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