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authorJoe Jin <joe.jin@oracle.com>2007-07-16 02:38:12 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-16 12:05:35 -0400
commitf96efd585b8d847181f81bf16721f96ded18d9fe (patch)
tree10821321b4f501e3126606ef2b54eb356ec8ef77 /mm/hugetlb.c
parent2706a1b89b1a3e7434a668d4a9d15f616da96685 (diff)
hugetlb: fix race in alloc_fresh_huge_page()
That static `nid' index needs locking. Without it we can end up calling alloc_pages_node() with an illegal node ID and the kernel crashes. Acked-by: gurudas pai <gurudas.pai@oracle.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/hugetlb.c')
-rw-r--r--mm/hugetlb.c15
1 files changed, 11 insertions, 4 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index eaba7d6b25a0..acc0fb3cf067 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -101,13 +101,20 @@ static void free_huge_page(struct page *page)
101 101
102static int alloc_fresh_huge_page(void) 102static int alloc_fresh_huge_page(void)
103{ 103{
104 static int nid = 0; 104 static int prev_nid;
105 struct page *page; 105 struct page *page;
106 page = alloc_pages_node(nid, GFP_HIGHUSER|__GFP_COMP|__GFP_NOWARN, 106 static DEFINE_SPINLOCK(nid_lock);
107 HUGETLB_PAGE_ORDER); 107 int nid;
108 nid = next_node(nid, node_online_map); 108
109 spin_lock(&nid_lock);
110 nid = next_node(prev_nid, node_online_map);
109 if (nid == MAX_NUMNODES) 111 if (nid == MAX_NUMNODES)
110 nid = first_node(node_online_map); 112 nid = first_node(node_online_map);
113 prev_nid = nid;
114 spin_unlock(&nid_lock);
115
116 page = alloc_pages_node(nid, GFP_HIGHUSER|__GFP_COMP|__GFP_NOWARN,
117 HUGETLB_PAGE_ORDER);
111 if (page) { 118 if (page) {
112 set_compound_page_dtor(page, free_huge_page); 119 set_compound_page_dtor(page, free_huge_page);
113 spin_lock(&hugetlb_lock); 120 spin_lock(&hugetlb_lock);