diff options
| author | Mark Hairgrove <[email protected]> | 2017-10-13 15:57:30 -0700 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2017-10-13 16:18:32 -0700 |
| commit | e20d103b6c37038ca27409f746f0b3351bcd0c44 (patch) | |
| tree | e1970efcd1f2792fc95c2fbd9054c59cb83c578a | |
| parent | 997301a860fca1a05ab8e383a8039b65f8abeb1e (diff) | |
mm/migrate: fix indexing bug (off by one) and avoid out of bound access
Index was incremented before last use and thus the second array could
dereference to an invalid address (not mentioning the fact that it did
not properly clear the entry we intended to clear).
Link: http://lkml.kernel.org/r/[email protected]
Fixes: 8315ada7f095bf ("mm/migrate: allow migrate_vma() to alloc new page on empty entry")
Signed-off-by: Mark Hairgrove <[email protected]>
Signed-off-by: Jérôme Glisse <[email protected]>
Cc: Reza Arbab <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
| -rw-r--r-- | mm/migrate.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/migrate.c b/mm/migrate.c index 6954c1435833..e00814ca390e 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -2146,8 +2146,9 @@ static int migrate_vma_collect_hole(unsigned long start, unsigned long addr; for (addr = start & PAGE_MASK; addr < end; addr += PAGE_SIZE) { - migrate->src[migrate->npages++] = MIGRATE_PFN_MIGRATE; + migrate->src[migrate->npages] = MIGRATE_PFN_MIGRATE; migrate->dst[migrate->npages] = 0; + migrate->npages++; migrate->cpages++; } |