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Naoya Horiguchi f683739539 mm/pagewalk.c: prevent positive return value of walk_page_test() from being passed to callers 
walk_page_test() is purely pagewalk's internal stuff, and its positive
return values are not intended to be passed to the callers of pagewalk.

However, in the current code if the last vma in the do-while loop in
walk_page_range() happens to return a positive value, it leaks outside
walk_page_range().  So the user visible effect is invalid/unexpected
return value (according to the reporter, mbind() causes it.)

This patch fixes it simply by reinitializing the return value after
checked.

Another exposed interface, walk_page_vma(), already returns 0 for such
cases so no problem.

Fixes: fafaa4264eba ("pagewalk: improve vma handling")
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Kazutomo Yoshii <kazutomo.yoshii@gmail.com>
Reported-by: Kazutomo Yoshii <kazutomo.yoshii@gmail.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-03-25 16:20:30 -07:00
..
kasan
kasan, module, vmalloc: rework shadow allocation for modules
2015-03-12 18:46:08 -07:00
backing-dev.c
Merge branch 'lazytime' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2015-02-17 16:12:34 -08:00
balloon_compaction.c
mm/balloon_compaction: fix deflation when compaction is disabled
2014-10-29 16:33:15 -07:00
bootmem.c
mem-hotplug: reset node managed pages when hot-adding a new pgdat
2014-11-13 16:17:06 -08:00
cleancache.c
mm: fix cleancache debugfs directory path
2015-01-20 14:08:31 +01:00
cma.c
mm: cma: fix CMA aligned offset calculation
2015-03-12 18:46:07 -07:00
compaction.c
mm: page_alloc: add kasan hooks on alloc and free paths
2015-02-13 21:21:41 -08:00
debug-pagealloc.c
mm/debug-pagealloc: make debug-pagealloc boottime configurable
2014-12-13 12:42:48 -08:00
debug.c
mm: account pmd page tables to the process
2015-02-11 17:06:04 -08:00
dmapool.c
mm/dmapool.c: fixed a brace coding style issue
2014-10-09 22:26:00 -04:00
early_ioremap.c
mm: create generic early_ioremap() support
2014-04-07 16:36:15 -07:00
fadvise.c
vfs: remove get_xip_mem
2015-02-16 17:56:03 -08:00
failslab.c
…
filemap.c
dax,ext2: replace XIP read and write with DAX I/O
2015-02-16 17:56:03 -08:00
frontswap.c
mm/frontswap.c: fix the condition in BUG_ON
2014-12-10 17:41:08 -08:00
gup.c
Tighten rules for ACCESS_ONCE
2015-02-14 10:54:28 -08:00
highmem.c
mm/highmem: make kmap cache coloring aware
2014-08-06 18:01:22 -07:00
huge_memory.c
mm: thp: Return the correct value for change_huge_pmd
2015-03-12 14:07:41 -07:00
hugetlb_cgroup.c
mm: page_counter: pull "-1" handling out of page_counter_memparse()
2015-02-11 17:06:02 -08:00
hugetlb.c
mm, hugetlb: close race when setting PageTail for gigantic pages
2015-03-12 18:46:07 -07:00
hwpoison-inject.c
mm/hwpoison-inject.c: remove unnecessary null test before debugfs_remove_recursive
2014-08-06 18:01:19 -07:00
init-mm.c
…
internal.h
mm/internal.h: don't split printk call in two
2015-02-12 18:54:10 -08:00
interval_tree.c
mm: replace vma->sharead.linear with vma->shared
2015-02-10 14:30:31 -08:00
Kconfig
Merge branch 'kconfig' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild
2015-02-19 10:36:45 -08:00
Kconfig.debug
mm/debug_pagealloc: remove obsolete Kconfig options
2015-01-08 15:10:52 -08:00
kmemcheck.c
mm/slab_common: move kmem_cache definition to internal header
2014-10-09 22:25:50 -04:00
kmemleak-test.c
mm/kmemleak-test.c: use pr_fmt for logging
2014-06-06 16:08:18 -07:00
kmemleak.c
kmemleak: disable kasan instrumentation for kmemleak
2015-02-13 21:21:41 -08:00
ksm.c
mm: remove rest usage of VM_NONLINEAR and pte_file()
2015-02-10 14:30:31 -08:00
list_lru.c
memcg: reparent list_lrus and free kmemcg_id on css offline
2015-02-12 18:54:10 -08:00
maccess.c
…
madvise.c
vfs: remove get_xip_mem
2015-02-16 17:56:03 -08:00
Makefile
move iov_iter.c from mm/ to lib/
2015-02-17 22:22:17 -05:00
memblock.c
mm/memblock.c: refactor functions to set/clear MEMBLOCK_HOTPLUG
2014-12-13 12:42:46 -08:00
memcontrol.c
memcg: disable hierarchy support if bound to the legacy cgroup hierarchy
2015-03-12 18:46:08 -07:00
memory_hotplug.c
mm, memory_hotplug/failure: drain single zone pcplists
2014-12-10 17:41:05 -08:00
memory-failure.c
mm: hwpoison: drop lru_add_drain_all() in __soft_offline_page()
2015-02-12 18:54:11 -08:00
memory.c
mm: fix up numa read-only thread grouping logic
2015-03-12 08:45:46 -07:00
mempolicy.c
mm: use %*pb[l] to print bitmaps including cpumasks and nodemasks
2015-02-13 21:21:38 -08:00
mempool.c
mm/mempool.c: update the kmemleak stack trace for mempool allocations
2014-06-06 16:08:17 -07:00
migrate.c
mm: convert p[te|md]_mknonnuma and remaining page table manipulations
2015-02-12 18:54:08 -08:00
mincore.c
mincore: apply page table walker on do_mincore()
2015-02-11 17:06:06 -08:00
mlock.c
mm: reorder can_do_mlock to fix audit denial
2015-03-12 18:46:08 -07:00
mm_init.c
mm/mm_init.c: mark mminit_loglevel __meminitdata
2015-02-12 18:54:11 -08:00
mmap.c
mm: fix anon_vma->degree underflow in anon_vma endless growing prevention
2015-03-25 16:20:30 -07:00
mmu_context.c
sched/mm: call finish_arch_post_lock_switch in idle_task_exit and use_mm
2014-02-21 08:50:17 +01:00
mmu_notifier.c
mmu_notifier: add the callback for mmu_notifier_invalidate_range()
2014-11-13 13:46:09 +11:00
mmzone.c
mm: microoptimize zonelist operations
2015-02-11 17:06:02 -08:00
mprotect.c
mm: numa: avoid unnecessary TLB flushes when setting NUMA hinting entries
2015-02-12 18:54:08 -08:00
mremap.c
mm: remove rest usage of VM_NONLINEAR and pte_file()
2015-02-10 14:30:31 -08:00
msync.c
mm: remove rest usage of VM_NONLINEAR and pte_file()
2015-02-10 14:30:31 -08:00
nobootmem.c
mem-hotplug: reset node managed pages when hot-adding a new pgdat
2014-11-13 16:17:06 -08:00
nommu.c
mm/nommu.c: export symbol max_mapnr
2015-03-12 18:46:08 -07:00
oom_kill.c
mm: account pmd page tables to the process
2015-02-11 17:06:04 -08:00
page_alloc.c
mm, oom: do not fail __GFP_NOFAIL allocation if oom killer is disabled
2015-03-12 18:46:07 -07:00
page_counter.c
mm: page_counter: pull "-1" handling out of page_counter_memparse()
2015-02-11 17:06:02 -08:00
page_ext.c
mm/page_owner: keep track of page owners
2014-12-13 12:42:48 -08:00
page_io.c
new helper: iov_iter_bvec()
2015-01-29 00:13:11 -05:00
page_isolation.c
mm, page_isolation: drain single zone pcplists
2014-12-10 17:41:05 -08:00
page_owner.c
mm/page_owner.c: remove unnecessary stack_trace field
2015-02-11 17:06:07 -08:00
page-writeback.c
Merge branch 'for-3.20/bdi' of git://git.kernel.dk/linux-block
2015-02-12 13:50:21 -08:00
pagewalk.c
mm/pagewalk.c: prevent positive return value of walk_page_test() from being passed to callers
2015-03-25 16:20:30 -07:00
percpu-km.c
percpu: implmeent pcpu_nr_empty_pop_pages and chunk->nr_populated
2014-09-02 14:46:05 -04:00
percpu-vm.c
percpu: move region iterations out of pcpu_[de]populate_chunk()
2014-09-02 14:46:02 -04:00
percpu.c
percpu: use %*pb[l] to print bitmaps including cpumasks and nodemasks
2015-02-13 21:21:37 -08:00
pgtable-generic.c
mm: convert p[te|md]_mknonnuma and remaining page table manipulations
2015-02-12 18:54:08 -08:00
process_vm_access.c
mm: gup: use get_user_pages_unlocked
2015-02-11 17:06:05 -08:00
quicklist.c
…
readahead.c
fs: export inode_to_bdi and use it in favor of mapping->backing_dev_info
2015-01-20 14:03:04 -07:00
rmap.c
mm: fix anon_vma->degree underflow in anon_vma endless growing prevention
2015-03-25 16:20:30 -07:00
shmem.c
mm: shmem: check for mapping owner before dereferencing
2015-02-23 10:00:11 -08:00
slab_common.c
mm: slub: add kernel address sanitizer support for slub allocator
2015-02-13 21:21:41 -08:00
slab.c
slub: make dead caches discard free slabs immediately
2015-02-12 18:54:10 -08:00
slab.h
slub: make dead caches discard free slabs immediately
2015-02-12 18:54:10 -08:00
slob.c
slub: make dead caches discard free slabs immediately
2015-02-12 18:54:10 -08:00
slub.c
mm: slub: add kernel address sanitizer support for slub allocator
2015-02-13 21:21:41 -08:00
sparse-vmemmap.c
mm/sparse: use memblock apis for early memory allocations
2014-01-21 16:19:47 -08:00
sparse.c
mm: use macros from compiler.h instead of __attribute__((...))
2014-04-07 16:35:54 -07:00
swap_cgroup.c
mm: page_cgroup: rename file to mm/swap_cgroup.c
2014-12-10 17:41:09 -08:00
swap_state.c
fs: remove mapping->backing_dev_info
2015-01-20 14:03:05 -07:00
swap.c
Merge branch 'for-3.20/bdi' of git://git.kernel.dk/linux-block
2015-02-12 13:50:21 -08:00
swapfile.c
mm: page_cgroup: rename file to mm/swap_cgroup.c
2014-12-10 17:41:09 -08:00
truncate.c
fs: export inode_to_bdi and use it in favor of mapping->backing_dev_info
2015-01-20 14:03:04 -07:00
util.c
mm/util: add kstrdup_const
2015-02-13 21:21:35 -08:00
vmacache.c
mm,vmacache: count number of system-wide flushes
2014-12-13 12:42:48 -08:00
vmalloc.c
kasan, module, vmalloc: rework shadow allocation for modules
2015-03-12 18:46:08 -07:00
vmpressure.c
mm/vmpressure.c: fix race in vmpressure_work_fn()
2014-12-02 17:32:07 -08:00
vmscan.c
Merge branch 'akpm' (patches from Andrew)
2015-02-12 18:54:28 -08:00
vmstat.c
vmstat: Reduce time interval to stat update on idle cpu
2015-02-11 17:06:07 -08:00
workingset.c
list_lru: add helpers to isolate items
2015-02-12 18:54:10 -08:00
zbud.c
mm/zpool: add name argument to create zpool
2015-02-12 18:54:12 -08:00
zpool.c
mm/zpool: add name argument to create zpool
2015-02-12 18:54:12 -08:00
zsmalloc.c
mm/zsmalloc: add statistics support
2015-02-12 18:54:12 -08:00
zswap.c
mm/zpool: add name argument to create zpool
2015-02-12 18:54:12 -08:00