From 54eed6cb16ec315565aaaf8e34252ca253a68b7b Mon Sep 17 00:00:00 2001 From: Petr Holasek Date: Thu, 8 Dec 2011 13:16:41 +0100 Subject: x86/numa: Add constraints check for nid parameters This patch adds constraint checks to the numa_set_distance() function. When the check triggers (this should not happen normally) it emits a warning and avoids a store to a negative index in numa_distance[] array - i.e. avoids memory corruption. Negative ids can be passed when the pxm-to-nids mapping is not properly filled while parsing the SRAT. Signed-off-by: Petr Holasek Acked-by: David Rientjes Cc: Anton Arapov Link: http://lkml.kernel.org/r/20111208121640.GA2229@dhcp-27-244.brq.redhat.com Signed-off-by: Ingo Molnar --- arch/x86/mm/numa.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c index fbeaaf41661..cdc00543d37 100644 --- a/arch/x86/mm/numa.c +++ b/arch/x86/mm/numa.c @@ -430,8 +430,9 @@ static int __init numa_alloc_distance(void) * calls are ignored until the distance table is reset with * numa_reset_distance(). * - * If @from or @to is higher than the highest known node at the time of - * table creation or @distance doesn't make sense, the call is ignored. + * If @from or @to is higher than the highest known node or lower than zero + * at the time of table creation or @distance doesn't make sense, the call + * is ignored. * This is to allow simplification of specific NUMA config implementations. */ void __init numa_set_distance(int from, int to, int distance) @@ -439,8 +440,9 @@ void __init numa_set_distance(int from, int to, int distance) if (!numa_distance && numa_alloc_distance() < 0) return; - if (from >= numa_distance_cnt || to >= numa_distance_cnt) { - printk_once(KERN_DEBUG "NUMA: Debug: distance out of bound, from=%d to=%d distance=%d\n", + if (from >= numa_distance_cnt || to >= numa_distance_cnt || + from < 0 || to < 0) { + pr_warn_once("NUMA: Warning: node ids are out of bound, from=%d to=%d distance=%d\n", from, to, distance); return; } -- cgit v1.2.3-70-g09d2