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authorVlastimil Babka <vbabka@suse.cz>2019-10-14 14:12:07 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-10-14 15:04:01 -0700
commita2e9a5afce080226edbf1882d63d99bf32070e9e (patch)
treef838a20edbf1b5627a41accd52cdfa11e334205a
parent3f36d8669457605910cb7a40089b485949569c41 (diff)
mm, compaction: fix wrong pfn handling in __reset_isolation_pfn()
Florian and Dave reported [1] a NULL pointer dereference in __reset_isolation_pfn(). While the exact cause is unclear, staring at the code revealed two bugs, which might be related. One bug is that if zone starts in the middle of pageblock, block_page might correspond to different pfn than block_pfn, and then the pfn_valid_within() checks will check different pfn's than those accessed via struct page. This might result in acessing an unitialized page in CONFIG_HOLES_IN_ZONE configs. The other bug is that end_page refers to the first page of next pageblock and not last page of current pageblock. The online and valid check is then wrong and with sections, the while (page < end_page) loop might wander off actual struct page arrays. [1] https://lore.kernel.org/linux-xfs/87o8z1fvqu.fsf@mid.deneb.enyo.de/ Link: http://lkml.kernel.org/r/20191008152915.24704-1-vbabka@suse.cz Fixes: 6b0868c820ff ("mm/compaction.c: correct zone boundary handling when resetting pageblock skip hints") Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Reported-by: Florian Weimer <fw@deneb.enyo.de> Reported-by: Dave Chinner <david@fromorbit.com> Acked-by: Mel Gorman <mgorman@techsingularity.net> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/compaction.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/mm/compaction.c b/mm/compaction.c
index ce08b39d85d4..672d3c78c6ab 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -270,14 +270,15 @@ __reset_isolation_pfn(struct zone *zone, unsigned long pfn, bool check_source,
/* Ensure the start of the pageblock or zone is online and valid */
block_pfn = pageblock_start_pfn(pfn);
- block_page = pfn_to_online_page(max(block_pfn, zone->zone_start_pfn));
+ block_pfn = max(block_pfn, zone->zone_start_pfn);
+ block_page = pfn_to_online_page(block_pfn);
if (block_page) {
page = block_page;
pfn = block_pfn;
}
/* Ensure the end of the pageblock or zone is online and valid */
- block_pfn += pageblock_nr_pages;
+ block_pfn = pageblock_end_pfn(pfn) - 1;
block_pfn = min(block_pfn, zone_end_pfn(zone) - 1);
end_page = pfn_to_online_page(block_pfn);
if (!end_page)
@@ -303,7 +304,7 @@ __reset_isolation_pfn(struct zone *zone, unsigned long pfn, bool check_source,
page += (1 << PAGE_ALLOC_COSTLY_ORDER);
pfn += (1 << PAGE_ALLOC_COSTLY_ORDER);
- } while (page < end_page);
+ } while (page <= end_page);
return false;
}