linux-kernel - [PATCH] arm64/numa: Add more vetting in numa_set

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Date:   Fri, 26 Oct 2018 21:57:47 +0800
From:   John Garry <john.garry@...wei.com>
To:     <catalin.marinas@....com>, <will.deacon@....com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linuxarm@...wei.com>,
        John Garry <john.garry@...wei.com>
Subject: [PATCH] arm64/numa: Add more vetting in numa_set_distance()

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@...wei.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