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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/1506973525-16491-1-git-send-email-jglisse@redhat.com
Fixes: 8315ada7f0 ("mm/migrate: allow migrate_vma() to alloc new page on empty entry")
Signed-off-by: Mark Hairgrove <mhairgrove@nvidia.com>
Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
Cc: Reza Arbab <arbab@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mark Hairgrove 2017-10-13 15:57:30 -07:00 committed by Linus Torvalds
parent 997301a860
commit e20d103b6c
1 changed files with 2 additions and 1 deletions
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3
mm/migrate.c
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@ -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++;
}