diff options
author | Carsten Otte <cotte@de.ibm.com> | 2009-02-04 23:12:16 (GMT) |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-02-05 20:56:48 (GMT) |
commit | ab92661d5d9514647346047f30f67a7f35ffea67 (patch) | |
tree | 3ed67a71d7cce6dbd5b6bd559966f7fc137c8f00 /REPORTING-BUGS | |
parent | 777c6c5f1f6e757ae49ecca2ed72d6b1f523c007 (diff) | |
download | linux-fsl-qoriq-ab92661d5d9514647346047f30f67a7f35ffea67.tar.xz |
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 b291f000393f5a0b679012b39d79fbc85c018233).
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>
Diffstat (limited to 'REPORTING-BUGS')
0 files changed, 0 insertions, 0 deletions