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Mon, 16 Jan 2023 19:58:56 +0800 From: Wupeng Ma To: CC: , , , , Subject: [PATCH v2 3/4] mm/mempolicy: return EINVAL if len overflows for mbind Date: Mon, 16 Jan 2023 19:58:12 +0800 Message-ID: <20230116115813.2956935-4-mawupeng1@huawei.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230116115813.2956935-1-mawupeng1@huawei.com> References: <20230116115813.2956935-1-mawupeng1@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.112.125] X-ClientProxiedBy: dggems703-chm.china.huawei.com (10.3.19.180) To dggpemm500014.china.huawei.com (7.185.36.153) X-CFilter-Loop: Reflected X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 922C44000D X-Rspam-User: X-Stat-Signature: 8fkuqgrffw3kwo765nkwof6qmzqm7emn X-HE-Tag: 1673870340-955234 X-HE-Meta: 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Ma Wupeng Return -EINVAL if len overflows for mbind. Signed-off-by: Ma Wupeng --- mm/mempolicy.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 153fda1ebb9c..4cb19a6e368b 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -1258,6 +1258,7 @@ static long do_mbind(unsigned long start, unsigned long len, nodemask_t *nmask, unsigned long flags) { struct mm_struct *mm = current->mm; + unsigned long old_len = len; struct mempolicy *new; unsigned long end; int err; @@ -1278,7 +1279,7 @@ static long do_mbind(unsigned long start, unsigned long len, 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;