From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, chen jie , Andrew Morton , Li Zefan , Yang Shi , Alexey Dobriyan , Linus Torvalds , Sasha Levin Subject: [PATCH 4.14 082/165] mm/memory.c: check return value of ioremap_prot Date: Mon, 3 Sep 2018 18:56:08 +0200 Message-Id: <20180903165659.191757538@linuxfoundation.org> In-Reply-To: <20180903165655.003605184@linuxfoundation.org> References: <20180903165655.003605184@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: "jie@chenjie6@huwei.com" [ Upstream commit 24eee1e4c47977bdfb71d6f15f6011e7b6188d04 ] ioremap_prot() can return NULL which could lead to an oops. Link: http://lkml.kernel.org/r/1533195441-58594-1-git-send-email-chenjie6@huawei.com Signed-off-by: chen jie Reviewed-by: Andrew Morton Cc: Li Zefan Cc: chenjie Cc: Yang Shi Cc: Alexey Dobriyan Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- mm/memory.c | 3 +++ 1 file changed, 3 insertions(+) --- a/mm/memory.c +++ b/mm/memory.c @@ -4348,6 +4348,9 @@ int generic_access_phys(struct vm_area_s return -EINVAL; maddr = ioremap_prot(phys_addr, PAGE_ALIGN(len + offset), prot); + if (!maddr) + return -ENOMEM; + if (write) memcpy_toio(maddr + offset, buf, len); else