4.9-stable review patch. If anyone has any objections, please let me know.
------------------ From: "jie@chenj...@huwei.com" <jie@chenj...@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-chenj...@huawei.com Signed-off-by: chen jie <chenj...@huawei.com> Reviewed-by: Andrew Morton <a...@linux-foundation.org> Cc: Li Zefan <lize...@huawei.com> Cc: chenjie <chenj...@huawei.com> Cc: Yang Shi <shy828...@gmail.com> Cc: Alexey Dobriyan <adobri...@gmail.com> Signed-off-by: Andrew Morton <a...@linux-foundation.org> Signed-off-by: Linus Torvalds <torva...@linux-foundation.org> Signed-off-by: Sasha Levin <alexander.le...@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> --- mm/memory.c | 3 +++ 1 file changed, 3 insertions(+) --- a/mm/memory.c +++ b/mm/memory.c @@ -3861,6 +3861,9 @@ 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
