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From: Wupeng Ma <mawupeng1@huawei.com>
To: <akpm@linux-foundation.org>
Cc: <linux-mm@kvack.org>, <linux-kernel@vger.kernel.org>,
	<mawupeng1@huawei.com>, <kuleshovmail@gmail.com>,
	<aneesh.kumar@linux.ibm.com>
Subject: [PATCH v2 2/4] mm/mempolicy: return EINVAL for if len overflows for set_mempolicy_home_node
Date: Mon, 16 Jan 2023 19:58:11 +0800	[thread overview]
Message-ID: <20230116115813.2956935-3-mawupeng1@huawei.com> (raw)
In-Reply-To: <20230116115813.2956935-1-mawupeng1@huawei.com>

From: Ma Wupeng <mawupeng1@huawei.com>

Return -EINVAL if len overflows for set_mempolicy_home_node.

Signed-off-by: Ma Wupeng <mawupeng1@huawei.com>
---
 mm/mempolicy.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 02c8a712282f..153fda1ebb9c 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1488,6 +1488,7 @@ SYSCALL_DEFINE4(set_mempolicy_home_node, unsigned long, start, unsigned long, le
 		unsigned long, home_node, unsigned long, flags)
 {
 	struct mm_struct *mm = current->mm;
+	unsigned long old_len = len;
 	struct vm_area_struct *vma;
 	struct mempolicy *new;
 	unsigned long vmstart;
@@ -1515,7 +1516,7 @@ SYSCALL_DEFINE4(set_mempolicy_home_node, unsigned long, start, unsigned long, le
 	len = PAGE_ALIGN(len);
 	end = start + len;
 
-	if (end < start)
+	if (end < start || (old_len != 0 && len == 0))
 		return -EINVAL;
 	if (end == start)
 		return 0;
-- 
2.25.1


  parent reply	other threads:[~2023-01-16 11:59 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-16 11:58 [PATCH v2 0/4] Add overflow checks for several syscalls Wupeng Ma
2023-01-16 11:58 ` [PATCH v2 1/4] mm/mlock: return EINVAL if len overflows for mlock/munlock Wupeng Ma
2023-01-16 20:51   ` Andrew Morton
2023-01-17  7:09     ` mawupeng
2023-01-16 11:58 ` Wupeng Ma [this message]
2023-01-16 11:58 ` [PATCH v2 3/4] mm/mempolicy: return EINVAL if len overflows for mbind Wupeng Ma
2023-01-16 11:58 ` [PATCH v2 4/4] mm/msync: return ENOMEM if len overflows for msync Wupeng Ma

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