From: chen jie <chen jie@chenjie6@xxxxxxxxx> ioremap_prot can return NULL which could lead to an oops Signed-off-by: chen jie <chenjie6@xxxxxxxxxx> --- mm/memory.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/memory.c b/mm/memory.c index 7206a63..316c42e 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -4397,6 +4397,9 @@ 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 -- 1.8.3.4
