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Mon, 16 Jan 2023 19:58:57 +0800 From: Wupeng Ma To: CC: , , , , Subject: [PATCH v2 4/4] mm/msync: return ENOMEM if len overflows for msync Date: Mon, 16 Jan 2023 19:58:13 +0800 Message-ID: <20230116115813.2956935-5-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-Queue-Id: 9876C1A0010 X-Stat-Signature: 3jurt13zhubozp68qcr43ph1wmhcdyt5 X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1673870340-607661 X-HE-Meta: U2FsdGVkX1+6a/Ib4DqKJHcRot5jRfvrKNbuAtgnxd8CNzK3IN1VGXwiTyRoPJhC2zif77yS75jqFWwQ9hlHMt3Nrlq/4uN9bVf3xbiyUDww9o7iWR1e9+Y7bpVj4FvzIWxj4/vQbRJf3C0q9KPMk1pO7v8k7NQRPPDawnb5geruAMzGkRINqgsWRldSC32z5sXSNwT48D8diWOdzkUflqG+v1/WZA5HR6/QYVFRKlMs5KJUXRH54oseKNHyHgTaiUnB2bZd+XD3GLtoy1Y+pb6iVt/Wfci2t5AAYKsQrZkYAytdtOXyPfgR4H8jdZow0bPsbbNqSG+qG7HGzHbdMLPO9SqP7bJJCsU+MXkhFF+s3Ku5B6kmUtYcaK1SGMas5QK2jT8SrK+jIU+h6unGZvp2aIaEY0VzQSBopOfFeyslo8kBRVy0HxhYnifhcQitUB3YJfZQHAR8S0LEJKJkCwHkmajkxa8VYa4oc2RZc83vcSR8Yxb/puDko3Iw75yimbSV0+2Bz42+1/IYXkTbLGnLulwgbbZi/9eSsiBEraTt1R9QeYnq55mGp+sJiElq2c7Fiq0yGlF1Gqh9m523n+FBihtzIo8lrncMVNiFvGIH11UbGh58waGsKIwS99IvkTonYRVNq8uB2Utu75s5Jazk7J7CDeUL2OP/qQfr/wWN3LIJ47X+GvXVl3wbXFI57dvBFSbw4CgsJMlbudAGwPL+2f20cH5d8mXjlgSMHY31LbfX4+6ox7jai+dWiFg9DBAoKXTAsoavGrOcasV6yN2WdPg3PXDmE4CEFFlUgZf2BfKCMY7feVfi4Au/B6pRMpC6R/PYS2mpRjEKcsdMaIS8bGujKHYCy1tovZsSzOI= 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 -ENOMEM if len overflows for msync. Signed-off-by: Ma Wupeng --- mm/msync.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/msync.c b/mm/msync.c index ac4c9bfea2e7..8ac227ec38af 100644 --- a/mm/msync.c +++ b/mm/msync.c @@ -36,6 +36,7 @@ SYSCALL_DEFINE3(msync, unsigned long, start, size_t, len, int, flags) struct vm_area_struct *vma; int unmapped_error = 0; int error = -EINVAL; + size_t old_len = len; start = untagged_addr(start); @@ -48,7 +49,7 @@ SYSCALL_DEFINE3(msync, unsigned long, start, size_t, len, int, flags) error = -ENOMEM; len = (len + ~PAGE_MASK) & PAGE_MASK; end = start + len; - if (end < start) + if (end < start || (old_len != 0 && len == 0)) goto out; error = 0; if (end == start)