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Carsten Otte ab92661d5d do_wp_page: fix regression with execute in place 
Fix do_wp_page for VM_MIXEDMAP mappings.

In the case where pfn_valid returns 0 for a pfn at the beginning of
do_wp_page and the mapping is not shared writable, the code branches to
label `gotten:' with old_page == NULL.

In case the vma is locked (vma->vm_flags & VM_LOCKED), lock_page,
clear_page_mlock, and unlock_page try to access the old_page.

This patch checks whether old_page is valid before it is dereferenced.

The regression was introduced by "mlock: mlocked pages are unevictable"
(commit b291f00039).

Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: <stable@kernel.org>		[2.6.28.x]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2009-02-05 12:56:48 -08:00
..
Kconfig Remove obsolete CONFIG_RESOURCES_64BIT 2009-01-06 15:59:14 -08:00
Makefile shmem: unify regular and tiny shmem 2009-01-06 15:59:08 -08:00
allocpercpu.c
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backing-dev.c Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-01-06 17:10:04 -08:00
bootmem.c bootmem: print request details before BUG_ON(them) 2009-01-06 15:59:10 -08:00
bounce.c
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dmapool.c
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fadvise.c [CVE-2009-0029] System call wrapper special cases 2009-01-14 14:15:18 +01:00
failslab.c
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filemap.c [CVE-2009-0029] System call wrapper special cases 2009-01-14 14:15:18 +01:00
filemap_xip.c badpage: remove vma from page_remove_rmap 2009-01-06 15:59:07 -08:00
fremap.c [CVE-2009-0029] System call wrappers part 13 2009-01-14 14:15:23 +01:00
highmem.c
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hugetlb.c mm: hugetlb: remove redundant `if' operation 2009-01-06 15:59:10 -08:00
internal.h mm: make get_user_pages() interruptible 2009-01-06 15:59:08 -08:00
maccess.c
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madvise.c [CVE-2009-0029] System call wrappers part 14 2009-01-14 14:15:24 +01:00
memcontrol.c memcg: NULL pointer dereference at rmdir on some NUMA systems 2009-01-29 18:04:44 -08:00
memory.c do_wp_page: fix regression with execute in place 2009-02-05 12:56:48 -08:00
memory_hotplug.c
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mempolicy.c [CVE-2009-0029] System call wrappers part 28 2009-01-14 14:15:30 +01:00
mempool.c
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migrate.c [CVE-2009-0029] System call wrappers part 28 2009-01-14 14:15:30 +01:00
mincore.c [CVE-2009-0029] System call wrappers part 14 2009-01-14 14:15:24 +01:00
mlock.c Manually revert "mlock: downgrade mmap sem while populating mlocked regions" 2009-02-01 11:00:16 -08:00
mm_init.c
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mmap.c Stop playing silly games with the VM_ACCOUNT flag 2009-01-31 15:08:56 -08:00
mmu_notifier.c
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mmzone.c
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mprotect.c [CVE-2009-0029] System call wrappers part 13 2009-01-14 14:15:23 +01:00
mremap.c [CVE-2009-0029] System call wrappers part 13 2009-01-14 14:15:23 +01:00
msync.c [CVE-2009-0029] System call wrappers part 13 2009-01-14 14:15:23 +01:00
nommu.c uclinux: add process name to allocation error message 2009-01-27 16:42:03 +10:00
oom_kill.c memcg: avoid deadlock caused by race between oom and cpuset_attach 2009-01-08 08:31:09 -08:00
page-writeback.c write-back: fix nr_to_write counter 2009-02-03 16:59:08 -08:00
page_alloc.c mm: introduce zone_reclaim struct 2009-01-08 08:31:07 -08:00
page_cgroup.c memcg: add mem_cgroup_disabled() 2009-01-08 08:31:05 -08:00
page_io.c
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page_isolation.c
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pagewalk.c
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pdflush.c
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prio_tree.c
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quicklist.c
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readahead.c
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rmap.c badpage: remove vma from page_remove_rmap 2009-01-06 15:59:07 -08:00
shmem.c Stop playing silly games with the VM_ACCOUNT flag 2009-01-31 15:08:56 -08:00
shmem_acl.c
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slab.c
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slob.c
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slub.c slub: fix per cpu kmem_cache_cpu array memory leak 2009-01-28 10:43:42 +02:00
sparse-vmemmap.c
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sparse.c
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swap.c memcg: add zone_reclaim_stat 2009-01-08 08:31:08 -08:00
swap_state.c memcg: mem+swap controller core 2009-01-08 08:31:05 -08:00
swapfile.c memcg: fix refcnt handling at swapoff 2009-01-29 18:04:43 -08:00
thrash.c
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truncate.c
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util.c
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vmalloc.c revert "mm: vmalloc use mutex for purge" 2009-01-15 16:39:40 -08:00
vmscan.c memcg: fix calculation of active_ratio 2009-01-08 08:31:09 -08:00
vmstat.c
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