linux-kernel - [PATCH 3.18 35/56] mm/memory.c: check return value of ioremap

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Date:   Mon,  3 Sep 2018 18:49:25 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, chen jie <chenjie6@...wei.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Li Zefan <lizefan@...wei.com>, Yang Shi <shy828301@...il.com>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 3.18 35/56] mm/memory.c: check return value of ioremap_prot

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "jie@...njie6@...ei.com" <jie@...njie6@...ei.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 <chenjie6@...wei.com>
Reviewed-by: Andrew Morton <akpm@...ux-foundation.org>
Cc: Li Zefan <lizefan@...wei.com>
Cc: chenjie <chenjie6@...wei.com>
Cc: Yang Shi <shy828301@...il.com>
Cc: Alexey Dobriyan <adobriyan@...il.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 mm/memory.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3522,6 +3522,9 @@ 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