From 15ec76fb29be31df2bccb30fc09875274cba2776 Mon Sep 17 00:00:00 2001
From: Xiu Jianfeng <xiujianfeng@huawei.com>
Date: Tue, 14 Jun 2022 10:14:49 +0800
Subject: [PATCH] selinux: Add boundary check in put_entry()
Git-commit: 15ec76fb29be31df2bccb30fc09875274cba2776
Patch-mainline: v6.0-rc1
References: git-fixes
Just like next_entry(), boundary check is necessary to prevent memory
out-of-bound access.
Signed-off-by: Xiu Jianfeng <xiujianfeng@huawei.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
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;
--
2.35.3