linux-kernel - [PATCH AUTOSEL 5.15 43/45] selinux: Add boundary check in put

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Date:   Sun,  7 Aug 2022 21:35:47 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Xiu Jianfeng <xiujianfeng@...wei.com>,
        Paul Moore <paul@...l-moore.com>,
        Sasha Levin <sashal@...nel.org>,
        stephen.smalley.work@...il.com, eparis@...isplace.org,
        selinux@...r.kernel.org
Subject: [PATCH AUTOSEL 5.15 43/45] selinux: Add boundary check in put_entry()

From: Xiu Jianfeng <xiujianfeng@...wei.com>

[ Upstream commit 15ec76fb29be31df2bccb30fc09875274cba2776 ]

Just like next_entry(), boundary check is necessary to prevent memory
out-of-bound access.

Signed-off-by: Xiu Jianfeng <xiujianfeng@...wei.com>
Signed-off-by: Paul Moore <paul@...l-moore.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 security/selinux/ss/policydb.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/security/selinux/ss/policydb.h b/security/selinux/ss/policydb.h
index c24d4e1063ea..ffc4e7bad205 100644
--- a/security/selinux/ss/policydb.h
+++ b/security/selinux/ss/policydb.h
@@ -370,6 +370,8 @@ static inline int put_entry(const void *buf, size_t bytes, int num, struct polic
 {
 	size_t len = bytes * num;
 
+	if (len > fp->len)
+		return -EINVAL;
 	memcpy(fp->data, buf, len);
 	fp->data += len;
 	fp->len -= len;
-- 
2.35.1