From: Yisheng Xie <xieyisheng1@huawei.com>
To: akpm@linux-foundation.org, vbabka@suse.cz, mhocko@suse.com,
mingo@kernel.org, rientjes@google.com, n-horiguchi@ah.jp.nec.com,
salls@cs.ucsb.edu
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
tanxiaojun@huawei.com, linux-api@vger.kernel.org
Subject: [PATCH RFC v2 2/4] mm/mempolicy: remove redundant check in get_nodes
Date: Fri, 27 Oct 2017 18:14:23 +0800 [thread overview]
Message-ID: <1509099265-30868-3-git-send-email-xieyisheng1@huawei.com> (raw)
In-Reply-To: <1509099265-30868-1-git-send-email-xieyisheng1@huawei.com>
We have already checked whether maxnode is a page worth of bits, by:
maxnode > PAGE_SIZE*BITS_PER_BYTE
So no need to check it once more.
Signed-off-by: Yisheng Xie <xieyisheng1@huawei.com>
---
mm/mempolicy.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 613e9d0..3b51bb3 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1280,8 +1280,6 @@ static int get_nodes(nodemask_t *nodes, const unsigned long __user *nmask,
/* When the user specified more nodes than supported just check
if the non supported part is all zero. */
if (nlongs > BITS_TO_LONGS(MAX_NUMNODES)) {
- if (nlongs > PAGE_SIZE/sizeof(long))
- return -EINVAL;
for (k = BITS_TO_LONGS(MAX_NUMNODES); k < nlongs; k++) {
unsigned long t;
if (get_user(t, nmask + k))
--
1.7.12.4
--
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next prev parent reply other threads:[~2017-10-27 10:23 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-27 10:14 [PATCH RFC v2 0/4] some fixes and clean up for mempolicy Yisheng Xie
2017-10-27 10:14 ` [PATCH RFC v2 1/4] mm/mempolicy: Fix get_nodes() mask miscalculation Yisheng Xie
2017-10-31 8:34 ` Vlastimil Babka
2017-11-01 9:37 ` Yisheng Xie
2017-10-27 10:14 ` Yisheng Xie [this message]
2017-10-31 8:55 ` [PATCH RFC v2 2/4] mm/mempolicy: remove redundant check in get_nodes Vlastimil Babka
2017-10-27 10:14 ` [PATCH RFC v2 3/4] mm/mempolicy: fix the check of nodemask from user Yisheng Xie
2017-10-31 9:30 ` Vlastimil Babka
2017-10-31 11:01 ` Yisheng Xie
2017-10-31 11:28 ` Vlastimil Babka
2017-10-27 10:14 ` [PATCH RFC v2 4/4] mm/mempolicy: add nodes_empty check in SYSC_migrate_pages Yisheng Xie
2017-10-31 9:46 ` Vlastimil Babka
2017-11-06 1:31 ` Yisheng Xie
2017-11-06 7:39 ` Vlastimil Babka
2017-11-06 15:29 ` Christopher Lameter
2017-11-07 11:23 ` Yisheng Xie
2017-11-07 14:54 ` Christopher Lameter
2017-11-07 15:05 ` Vlastimil Babka
2017-11-07 15:55 ` Christopher Lameter
2017-11-08 1:38 ` Yisheng Xie
2017-11-08 15:02 ` Christopher Lameter
2017-11-09 10:54 ` Yisheng Xie
2017-11-09 15:46 ` Christopher Lameter
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