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Tue, 20 Jan 2026 03:30:29 -0800 (PST) Received: from nwang-tw.host.com ([124.127.58.139]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-352d57a56f2sm1045900a91.15.2026.01.20.03.30.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 20 Jan 2026 03:30:29 -0800 (PST) From: iamhswang@gmail.com To: richard@nod.at, anton.ivanov@cambridgegreys.com, johannes@sipsolutions.net, akpm@linux-foundation.org, dave.hansen@linux.intel.com, tiwei.btw@antgroup.com, rppt@kernel.org, kevin.brodsky@arm.com, snovitoll@gmail.com, linux@weissschuh.net Cc: linux-um@lists.infradead.org, linux-kernel@vger.kernel.org, iamhswang@gmail.com Subject: [PATCH 1/2] um: add uml_kmalloc_array() helper to avoid potential Date: Tue, 20 Jan 2026 19:28:54 +0800 Message-ID: <20260120112938.463596-1-iamhswang@gmail.com> X-Mailer: git-send-email 2.52.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Haisu Wang Add uml_kmalloc_array to avoid potential dynamic multiplication overflow. Since in Documentation/process/deprecated.rst, the preferred way is avoid the open-coded arithmetic. Signed-off-by: Haisu Wang --- arch/um/include/shared/um_malloc.h | 1 + arch/um/kernel/mem.c | 5 +++++ 2 files changed, 6 insertions(+) diff --git a/arch/um/include/shared/um_malloc.h b/arch/um/include/shared/um_malloc.h index 815dd03e8707..a55a81131e10 100644 --- a/arch/um/include/shared/um_malloc.h +++ b/arch/um/include/shared/um_malloc.h @@ -9,6 +9,7 @@ #include extern void *uml_kmalloc(int size, int flags); +extern void *uml_kmalloc_array(int count, int size, int flags); extern void kfree(const void *ptr); extern void *vmalloc_noprof(unsigned long size); diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c index 39c4a7e21c6f..3bf9e9bef3bf 100644 --- a/arch/um/kernel/mem.c +++ b/arch/um/kernel/mem.c @@ -126,6 +126,11 @@ void *uml_kmalloc(int size, int flags) return kmalloc(size, flags); } +void *uml_kmalloc_array(int count, int size, int flags) +{ + return kmalloc_array(count, size, flags); +} + static const pgprot_t protection_map[16] = { [VM_NONE] = PAGE_NONE, [VM_READ] = PAGE_READONLY, -- 2.52.0