From: Wenchao Hao Date: Wed, 12 Aug 2020 01:31:16 +0000 (-0700) Subject: mm/mempolicy.c: check parameters first in kernel_get_mempolicy X-Git-Tag: v5.9-rc1~52^2~145 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=4605f057aace9291e80bf9982cc7c8babc917f56;p=linux-block.git mm/mempolicy.c: check parameters first in kernel_get_mempolicy Previous implementatoin calls untagged_addr() before error check, while if the error check failed and return EINVAL, the untagged_addr() call is just useless work. Signed-off-by: Wenchao Hao Signed-off-by: Andrew Morton Reviewed-by: Andrew Morton Link: http://lkml.kernel.org/r/20200801090825.5597-1-haowenchao22@gmail.com Signed-off-by: Linus Torvalds --- diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 92030ead2506..25b7e412c20b 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -1632,11 +1632,11 @@ static int kernel_get_mempolicy(int __user *policy, int pval; nodemask_t nodes; - addr = untagged_addr(addr); - if (nmask != NULL && maxnode < nr_node_ids) return -EINVAL; + addr = untagged_addr(addr); + err = do_get_mempolicy(&pval, &nodes, addr, flags); if (err)