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Libin a8f531ebc3 mm/huge_memory.c: fix potential NULL pointer dereference 
In collapse_huge_page() there is a race window between releasing the
mmap_sem read lock and taking the mmap_sem write lock, so find_vma() may
return NULL.  So check the return value to avoid NULL pointer dereference.

collapse_huge_page
	khugepaged_alloc_page
		up_read(&mm->mmap_sem)
	down_write(&mm->mmap_sem)
	vma = find_vma(mm, address)

Signed-off-by: Libin <huawei.libin@huawei.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Cc: <stable@vger.kernel.org> # v3.0+
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-09-11 15:57:19 -07:00
..
backing-dev.c
backing-dev: convert class code to use dev_groups
2013-08-19 21:22:34 -07:00
balloon_compaction.c
mm: introduce a common interface for balloon pages mobility
2012-12-11 17:22:26 -08:00
bootmem.c
mm: kill free_all_bootmem_node()
2013-07-03 16:07:39 -07:00
bounce.c
Merge branch 'for-3.10/core' of git://git.kernel.dk/linux-block
2013-05-08 10:13:35 -07:00
cleancache.c
mm: cleancache: clean up cleancache_enabled
2013-04-30 17:04:01 -07:00
compaction.c
mm: add & use zone_end_pfn() and zone_spans_pfn()
2013-02-23 17:50:20 -08:00
debug-pagealloc.c
mm, x86: Remove debug_pagealloc_enabled
2011-12-06 09:24:07 +01:00
dmapool.c
dmapool: make DMAPOOL_DEBUG detect corruption of free marker
2012-12-11 17:22:24 -08:00
fadvise.c
teach SYSCALL_DEFINE<n> how to deal with long long/unsigned long long
2013-03-03 22:46:22 -05:00
failslab.c
switch debugfs to umode_t
2012-01-03 22:54:56 -05:00
filemap_xip.c
lift sb_start_write() out of ->write()
2013-04-09 14:12:56 -04:00
filemap.c
direct-io: Handle O_(D)SYNC AIO
2013-09-04 09:23:46 -04:00
fremap.c
mm: save soft-dirty bits on file pages
2013-08-13 17:57:48 -07:00
frontswap.c
frontswap: fix incorrect zeroing and allocation size for frontswap_map
2013-06-12 16:29:46 -07:00
highmem.c
Some nice cleanups, and even a patch my wife did as a "live" demo for
2012-12-20 08:37:05 -08:00
huge_memory.c
mm/huge_memory.c: fix potential NULL pointer dereference
2013-09-11 15:57:19 -07:00
hugetlb_cgroup.c
cgroup: pass around cgroup_subsys_state instead of cgroup in file methods
2013-08-08 20:11:24 -04:00
hugetlb.c
mm: replace strict_strtoul() with kstrtoul()
2013-09-11 15:57:11 -07:00
hwpoison-inject.c
memcg: rename config variables
2012-07-31 18:42:43 -07:00
init-mm.c
atomic: use <linux/atomic.h>
2011-07-26 16:49:47 -07:00
internal.h
mm: remove unused __put_page()
2013-07-09 10:33:22 -07:00
interval_tree.c
mm: add CONFIG_DEBUG_VM_RB build option
2012-10-09 16:22:42 +09:00
Kconfig
Merge remote-tracking branch 'origin/next' into kvm-ppc-next
2013-08-29 00:41:59 +02:00
Kconfig.debug
mm: more intensive memory corruption debugging
2012-01-10 16:30:42 -08:00
kmemcheck.c
…
kmemleak-test.c
…
kmemleak.c
mm: replace strict_strtoul() with kstrtoul()
2013-09-11 15:57:11 -07:00
ksm.c
mm: replace strict_strtoul() with kstrtoul()
2013-09-11 15:57:11 -07:00
maccess.c
mm: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
madvise.c
mm/madvise.c: fix coding-style errors
2013-09-11 15:57:00 -07:00
Makefile
zswap: add to mm/
2013-07-10 18:11:34 -07:00
memblock.c
mm/memblock.c: fix wrong comment in __next_free_mem_range()
2013-07-09 10:33:23 -07:00
memcontrol.c
Merge branch 'for-3.12' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
2013-09-03 18:25:03 -07:00
memory_hotplug.c
mm/memory_hotplug.c: fix return value of online_pages()
2013-07-09 10:33:25 -07:00
memory-failure.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2013-09-06 09:36:28 -07:00
memory.c
Merge 3.11-rc6 into char-misc-next
2013-08-18 20:40:33 -07:00
mempolicy.c
mm: mempolicy: turn vma_set_policy() into vma_dup_policy()
2013-09-11 15:57:00 -07:00
mempool.c
mempool: add @gfp_mask to mempool_create_node()
2012-06-25 11:53:47 +02:00
migrate.c
mm: migration: add migrate_entry_wait_huge()
2013-06-12 16:29:46 -07:00
mincore.c
swap: make each swap partition have one address_space
2013-02-23 17:50:17 -08:00
mlock.c
Revert "mm: introduce VM_POPULATE flag to better deal with racy userspace programs"
2013-03-28 17:45:51 -07:00
mm_init.c
mm: tune vm_committed_as percpu_counter batching size
2013-07-03 16:07:32 -07:00
mmap.c
mm: mmap_region: kill correct_wcount/inode, use allow_write_access()
2013-09-11 15:57:07 -07:00
mmu_context.c
mm: remove old aio use_mm() comment
2013-05-07 18:38:27 -07:00
mmu_notifier.c
treewide: relase -> release
2013-06-28 14:34:33 +02:00
mmzone.c
mm: rename page struct field helpers
2013-02-23 17:50:18 -08:00
mprotect.c
mm/mprotect.c: coding-style cleanups
2012-12-18 15:02:15 -08:00
mremap.c
mm: move_ptes -- Set soft dirty bit depending on pte type
2013-08-27 09:36:17 -07:00
msync.c
…
nobootmem.c
mm: concentrate modification of totalram_pages into the mm core
2013-07-03 16:07:33 -07:00
nommu.c
mm: remove free_area_cache
2013-07-10 18:11:34 -07:00
oom_kill.c
mm/oom_kill: remove weird use of ERR_PTR()/PTR_ERR().
2013-07-15 11:25:05 +09:30
page_alloc.c
mm: kill one if loop in __free_pages_bootmem()
2013-09-11 15:57:19 -07:00
page_cgroup.c
memcontrol: use N_MEMORY instead N_HIGH_MEMORY
2012-12-12 17:38:32 -08:00
page_io.c
mm: remove compressed copy from zram in-memory
2013-07-03 16:07:26 -07:00
page_isolation.c
page_isolation: Fix a comment typo in test_pages_isolated()
2013-08-20 13:03:41 +02:00
page-writeback.c
kernel: delete __cpuinit usage from all core kernel files
2013-07-14 19:36:59 -04:00
pagewalk.c
mm/pagewalk.c: walk_page_range should avoid VM_PFNMAP areas
2013-05-24 16:22:53 -07:00
percpu-km.c
…
percpu-vm.c
mm: fix kernel-doc warnings
2012-06-20 14:39:36 -07:00
percpu.c
mm, percpu: Make sure percpu_alloc early parameter has an argument
2012-12-02 06:23:04 -08:00
pgtable-generic.c
mm/THP: add pmd args to pgtable deposit and withdraw APIs
2013-06-20 16:55:07 +10:00
process_vm_access.c
Fix: compat_rw_copy_check_uvector() misuse in aio, readv, writev, and security keys
2013-03-12 11:05:45 -07:00
quicklist.c
mm: delete various needless include <linux/module.h>
2011-10-31 09:20:11 -04:00
readahead.c
mm: change invalidatepage prototype to accept length
2013-05-21 23:17:23 -04:00
rmap.c
s390/mm: implement software referenced bits
2013-08-29 13:20:11 +02:00
shmem.c
shm_mnt is as longterm as it gets, TYVM...
2013-09-03 22:50:27 -04:00
slab_common.c
Merge branch 'slab/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux
2013-07-14 15:14:29 -07:00
slab.c
kernel: delete __cpuinit usage from all core kernel files
2013-07-14 19:36:59 -04:00
slab.h
memcg: check that kmem_cache has memcg_params before accessing it
2013-08-28 19:26:38 -07:00
slob.c
Merge branch 'slab/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux
2013-07-14 15:14:29 -07:00
slub.c
mm: replace strict_strtoul() with kstrtoul()
2013-09-11 15:57:11 -07:00
sparse-vmemmap.c
sparse-vmemmap: specify vmemmap population range in bytes
2013-04-29 15:54:35 -07:00
sparse.c
mm/sparse.c: put clear_hwpoisoned_pages within CONFIG_MEMORY_HOTREMOVE
2013-07-09 10:33:22 -07:00
swap_state.c
swap: avoid read_swap_cache_async() race to deadlock while waiting on discard I/O completion
2013-06-12 16:29:45 -07:00
swap.c
thp, mm: avoid PageUnevictable on active/inactive lru lists
2013-07-31 14:41:03 -07:00
swapfile.c
swap: make cluster allocation per-cpu
2013-09-11 15:57:17 -07:00
truncate.c
mm: teach truncate_inode_pages_range() to handle non page aligned ranges
2013-05-27 23:32:35 -04:00
util.c
mm: remove free_area_cache
2013-07-10 18:11:34 -07:00
vmalloc.c
mm/vmalloc.c: fix an overflow bug in alloc_vmap_area()
2013-07-09 10:33:23 -07:00
vmpressure.c
Merge branch 'for-3.12' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
2013-09-03 18:25:03 -07:00
vmscan.c
mm: vmscan: do not scale writeback pages when deciding whether to set ZONE_WRITEBACK
2013-07-09 10:33:23 -07:00
vmstat.c
mm: vmstats: track TLB flush stats on UP too
2013-09-11 15:57:09 -07:00
zbud.c
mm: zbud: fix condition check on allocation size
2013-07-31 14:41:03 -07:00
zswap.c
mm/zswap.c: get swapper address_space by using macro
2013-09-11 15:57:08 -07:00