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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 <haowenchao22@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/20200801090825.5597-1-haowenchao22@gmail.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wenchao Hao 2020-08-11 18:31:16 -07:00 committed by Linus Torvalds
parent f6e92f4048
commit 4605f057aa
1 changed files with 2 additions and 2 deletions
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4
mm/mempolicy.c
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@ -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)