Xiaotian Feng ff8c1474cc block: fix ioc leak in put_io_context ...

When put_io_context is called, if ioc->icq_list is empty and refcount
is 1, kernel will not free the ioc.

This is caught by following kmemleak:

unreferenced object 0xffff880036349fe0 (size 216):
  comm "sh", pid 2137, jiffies 4294931140 (age 290579.412s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    01 00 01 00 ad 4e ad de ff ff ff ff 00 00 00 00  .....N..........
  backtrace:
    [<ffffffff8169f926>] kmemleak_alloc+0x26/0x50
    [<ffffffff81195a9c>] kmem_cache_alloc_node+0x1cc/0x2a0
    [<ffffffff81356b67>] create_io_context_slowpath+0x27/0x130
    [<ffffffff81356d2b>] get_task_io_context+0xbb/0xf0
    [<ffffffff81055f0e>] copy_process+0x188e/0x18b0
    [<ffffffff8105609b>] do_fork+0x11b/0x420
    [<ffffffff810247f8>] sys_clone+0x28/0x30
    [<ffffffff816d3373>] stub_clone+0x13/0x20
    [<ffffffffffffffff>] 0xffffffffffffffff

ioc should be freed if ioc->icq_list is empty.
Signed-off-by: Xiaotian Feng <dannyfeng@tencent.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

2012-03-14 15:34:48 +01:00

..

partitions

separate partition format handling from generic code

2012-01-03 22:54:06 -05:00

blk-cgroup.c

block: strip out locking optimization in put_io_context()

2012-02-07 07:51:30 +01:00

blk-cgroup.h

block: fix a typo in the blk-cgroup.h file

2011-10-24 16:08:38 +02:00

blk-core.c

block: don't call elevator callbacks for plug merges

2012-02-08 09:19:42 +01:00

blk-exec.c

block: add missing blk_queue_dead() checks

2011-12-14 00:33:37 +01:00

blk-flush.c

blk-flush: move the queue kick into

2011-10-24 16:24:31 +02:00

blk-integrity.c

block: add export.h to files using EXPORT_SYMBOL/THIS_MODULE macros

2011-10-31 19:31:12 -04:00

blk-ioc.c

block: fix ioc leak in put_io_context

2012-03-14 15:34:48 +01:00

blk-iopoll.c

tree-wide: fix assorted typos all over the place

2009-12-04 15:39:55 +01:00

blk-lib.c

block: fix patch import error in max_discard_sectors check

2011-07-23 20:34:59 +02:00

blk-map.c

block: re-use existing 'reading' variable instead of checking direction again

2011-12-21 15:27:24 +01:00

blk-merge.c

block: separate out blk_rq_merge_ok() and blk_try_merge() from elevator functions

2012-02-08 09:19:38 +01:00

blk-settings.c

block: Introduce blk_set_stacking_limits function

2012-01-11 16:27:11 +01:00

blk-softirq.c

block: Don't check QUEUE_FLAG_SAME_COMP in __blk_complete_request

2011-09-14 09:31:01 +02:00

blk-sysfs.c

block, cfq: move io_cq exit/release to blk-ioc.c

2011-12-14 00:33:42 +01:00

blk-tag.c

block: fix blk_queue_end_tag()

2011-12-29 09:16:28 +01:00

blk-throttle.c

block: add blk_queue_dead()

2011-12-14 00:33:37 +01:00

blk-timeout.c

fault-injection: add ability to export fault_attr in arbitrary directory

2011-08-03 14:25:20 -10:00

blk.h

block: separate out blk_rq_merge_ok() and blk_try_merge() from elevator functions

2012-02-08 09:19:38 +01:00

bsg-lib.c

block: Change module.h -> export.h in bsg-lib.c

2011-10-31 19:31:13 -04:00

bsg.c

bsg: fix sysfs link remove warning

2012-02-08 20:02:03 +01:00

cfq-iosched.c

block: replace icq->changed with icq->flags

2012-02-15 09:45:49 +01:00

cfq.h

blk-cgroup: Add unaccounted time to timeslice_used.

2011-03-12 16:54:00 +01:00

compat_ioctl.c

block: Add BLKROTATIONAL ioctl

2012-01-11 16:29:31 +01:00

deadline-iosched.c

block, cfq: move icq cache management to block core

2011-12-14 00:33:42 +01:00

elevator.c

block: separate out blk_rq_merge_ok() and blk_try_merge() from elevator functions

2012-02-08 09:19:38 +01:00

genhd.c

Block: use a freezable workqueue for disk-event polling

2012-03-02 10:51:00 +01:00

ioctl.c

Merge branch 'for-3.3/core' of git://git.kernel.dk/linux-block

2012-01-15 12:24:45 -08:00

Kconfig

move fs/partitions to block/

2012-01-03 22:54:06 -05:00

Kconfig.iosched

blk-cgroup: config options re-arrangement

2010-04-26 19:27:56 +02:00

Makefile

separate partition format handling from generic code

2012-01-03 22:54:06 -05:00

noop-iosched.c

block, cfq: move icq cache management to block core

2011-12-14 00:33:42 +01:00

partition-generic.c

block: Fix NULL pointer dereference in sd_revalidate_disk

2012-03-02 10:38:33 +01:00

scsi_ioctl.c

block: fail SCSI passthrough ioctls on partition devices

2012-01-14 15:07:24 -08:00