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author | jie@chenjie6@huwei.com <jie@chenjie6@huwei.com> | 2018-08-11 03:23:06 +0300 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-05 10:26:33 +0300 |
commit | cf7ab2abc524ec8499fabfa064d9c1f754092908 (patch) | |
tree | faabf17b5359ab3bf48080c75a729d291da105b5 | |
parent | 7bb880a11650bcc761806dbd1484c887c2617f73 (diff) | |
download | linux-cf7ab2abc524ec8499fabfa064d9c1f754092908.tar.xz |
mm/memory.c: check return value of ioremap_prot
[ 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@huawei.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Li Zefan <lizefan@huawei.com>
Cc: chenjie <chenjie6@huawei.com>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r-- | mm/memory.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/memory.c b/mm/memory.c index 1d61c5fe12ef..72e1dfa84819 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -4348,6 +4348,9 @@ int generic_access_phys(struct vm_area_struct *vma, unsigned long addr, 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 |