From: John Garry <john.garry@huawei.com>
To: <catalin.marinas@arm.com>, <will.deacon@arm.com>
Cc: <linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, <linuxarm@huawei.com>,
John Garry <john.garry@huawei.com>
Subject: [PATCH] arm64/numa: Add more vetting in numa_set_distance()
Date: Fri, 26 Oct 2018 21:57:47 +0800 [thread overview]
Message-ID: <1540562267-101152-1-git-send-email-john.garry@huawei.com> (raw)
Currently it is acceptable to set the distance between 2 separate nodes to
LOCAL_DISTANCE.
Reject this as it is invalid.
This change avoids a crash reported in [1].
[1] https://www.spinics.net/lists/arm-kernel/msg683304.html
Signed-off-by: John Garry <john.garry@huawei.com>
diff --git a/arch/arm64/mm/numa.c b/arch/arm64/mm/numa.c
index 146c04c..6092e3d 100644
--- a/arch/arm64/mm/numa.c
+++ b/arch/arm64/mm/numa.c
@@ -335,7 +335,8 @@ void __init numa_set_distance(int from, int to, int distance)
}
if ((u8)distance != distance ||
- (from == to && distance != LOCAL_DISTANCE)) {
+ (from == to && distance != LOCAL_DISTANCE) ||
+ (from != to && distance == LOCAL_DISTANCE)) {
pr_warn_once("Warning: invalid distance parameter, from=%d to=%d distance=%d\n",
from, to, distance);
return;
--
1.9.1
next reply other threads:[~2018-10-26 13:56 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-26 13:57 John Garry [this message]
2018-10-29 11:25 ` [PATCH] arm64/numa: Add more vetting in numa_set_distance() Will Deacon
2018-10-29 12:14 ` John Garry
2018-10-29 12:16 ` Will Deacon
2018-10-29 12:32 ` John Garry
2018-10-29 12:45 ` Anshuman Khandual
2018-10-29 14:44 ` John Garry
2018-10-30 2:46 ` Anshuman Khandual
2018-11-01 11:27 ` Will Deacon
2018-11-01 11:39 ` John Garry
2018-11-08 14:20 ` Anshuman Khandual
2018-10-29 14:48 ` Will Deacon
2018-10-30 3:00 ` Anshuman Khandual
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