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| author | jie@chenjie6@huwei.com <jie@chenjie6@huwei.com> | 2018-08-11 02:23:06 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-08-11 05:19:58 +0200 |
| commit | 24eee1e4c47977bdfb71d6f15f6011e7b6188d04 (patch) | |
| tree | bb2ab1880fdbaf2f3351470eabe98bf2b7acaf64 /mm/memory.c | |
| parent | lib/ubsan: remove null-pointer checks (diff) | |
| download | linux-24eee1e4c47977bdfb71d6f15f6011e7b6188d04.tar.xz linux-24eee1e4c47977bdfb71d6f15f6011e7b6188d04.zip | |
mm/memory.c: check return value of ioremap_prot
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>
Diffstat (limited to 'mm/memory.c')
| -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 dab1511294ad..c5e87a3a82ba 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -4395,6 +4395,9 @@ 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 |