From: Ma Wupeng <mawupeng1@xxxxxxxxxx> Add access_ok to check user memory range and return EINVAL if overflows. Signed-off-by: Ma Wupeng <mawupeng1@xxxxxxxxxx> --- mm/mempolicy.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 61aa9aedb728..e3a2c465fe8a 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -1499,6 +1499,10 @@ SYSCALL_DEFINE4(set_mempolicy_home_node, unsigned long, start, unsigned long, le start = untagged_addr(start); if (start & ~PAGE_MASK) return -EINVAL; + + if (unlikely(!access_ok((void __user *)start, len))) + return -EINVAL; + /* * flags is used for future extension if any. */ -- 2.25.1
