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author | Xue jiufei <xuejiufei@huawei.com> | 2013-07-03 15:01:10 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-07-03 16:07:25 -0700 |
commit | 4a184b4ff424e544359f081087723fc36efe603e (patch) | |
tree | 9d882bd2e436365a0669b5f29f0bb0caeeb108b0 /drivers/cdrom | |
parent | ocfs2: adjust switch_case syntax at o2net_state_change() (diff) | |
download | wireguard-linux-4a184b4ff424e544359f081087723fc36efe603e.tar.xz wireguard-linux-4a184b4ff424e544359f081087723fc36efe603e.zip |
ocfs2: fix NULL pointer dereference when traversing o2hb_all_regions
There may exist NULL pointer dereference in config_item_name() when one
volume (say Volume A) unmounts while another (say Volume B) mounting.
Volume A Volume B
already Mounted.
Unmounting, call
o2hb_heartbeat_group_drop_item()
-> config_item_put(item)
set reg(A)->item.ci_name to NULL
in function config_item_cleanup().
begin mounting, call
o2hb_region_pin() and tranverse all
regions. When reading
reg(A)->item.ci_name, it causes
NULL pointer dereference.
call o2hb_region_release() and
del reg(A) from list.
So we should skip accessing regions that is going to release when
tranverse o2hb_all_regions.
Signed-off-by: Yiwen Jiang <jiangyiwen@huawei.com>
Signed-off-by: joyce <xuejiufei@huawei.com>
Acked-by: Joel Becker <jlbec@evilplan.org>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Sunil Mushran <sunil.mushran@gmail.com>
Cc: Jie Liu <jeff.liu@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/cdrom')
0 files changed, 0 insertions, 0 deletions