Francesco Ruggeri 6bf6104573 fs/proc: fix potential unregister_sysctl_table hang ...

The unregister_sysctl_table() function hangs if all references to its
ctl_table_header structure are not dropped.

This can happen sometimes because of a leak in proc_sys_lookup():
proc_sys_lookup() gets a reference to the table via lookup_entry(), but
it does not release it when a subsequent call to sysctl_follow_link()
fails.

This patch fixes this leak by making sure the reference is always
dropped on return.

See also commit 076c3eed2c31 ("sysctl: Rewrite proc_sys_lookup
introducing find_entry and lookup_entry") which reorganized this code in
3.4.

Tested in Linux 3.4.4.

Signed-off-by: Francesco Ruggeri <fruggeri@aristanetworks.com>
Cc: stable@vger.kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2012-09-17 10:32:03 -07:00

..

array.c

c/r: procfs: add arg_start/end, env_start/end and exit_code members to /proc/$pid/stat

2012-05-31 17:49:32 -07:00

base.c

proc: do not allow negative offsets on /proc/<pid>/environ

2012-07-30 17:25:20 -07:00

cmdline.c

proc: switch /proc/cmdline to seq_file

2008-10-23 14:29:04 +04:00

consoles.c

console: rename acquire/release_console_sem() to console_lock/unlock()

2011-01-26 10:50:06 +10:00

cpuinfo.c

proc: move /proc/cpuinfo code to fs/proc/cpuinfo.c

2008-10-23 15:05:11 +04:00

devices.c

proc: use seq_puts()/seq_putc() where possible

2011-01-13 08:03:16 -08:00

generic.c

stop passing nameidata to ->lookup()

2012-07-14 16:34:32 +04:00

inode.c

avoid iput() from flusher thread

2012-05-28 09:54:45 -07:00

internal.h

stop passing nameidata to ->lookup()

2012-07-14 16:34:32 +04:00

interrupts.c

proc: move /proc/interrupts boilerplate code to fs/proc/interrupts.c

2008-10-23 15:15:46 +04:00

Kconfig

kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT

2011-01-20 17:02:05 -08:00

kcore.c

fs/proc/kcore.c: make get_sparsemem_vmemmap_info() static

2012-03-23 16:58:42 -07:00

kmsg.c

procfs: Use generic_file_llseek in /proc/kmsg

2010-04-09 16:35:41 +02:00

loadavg.c

sched, timers: cleanup avenrun users

2009-05-15 15:32:45 +02:00

Makefile

ns: proc files for namespace naming policy.

2011-05-10 14:31:44 -07:00

meminfo.c

fs/proc/meminfo.c: fix compilation error

2011-12-09 07:50:28 -08:00

mmu.c

fs/proc/mmu.c: headers butchery

2007-10-17 08:42:48 -07:00

namespaces.c

stop passing nameidata to ->lookup()

2012-07-14 16:34:32 +04:00

nommu.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

page.c

pagemap: export KPF_THP

2012-03-21 17:54:57 -07:00

proc_devtree.c

of: Improve prom_update_property() function

2012-07-11 15:26:51 +10:00

proc_net.c

stop passing nameidata to ->lookup()

2012-07-14 16:34:32 +04:00

proc_sysctl.c

fs/proc: fix potential unregister_sysctl_table hang

2012-09-17 10:32:03 -07:00

proc_tty.c

proc: use seq_puts()/seq_putc() where possible

2011-01-13 08:03:16 -08:00

root.c

VFS: Pass mount flags to sget()

2012-07-14 16:38:34 +04:00

softirqs.c

proc: use seq_puts()/seq_putc() where possible

2011-01-13 08:03:16 -08:00

stat.c

proc: stats: Use arch_idle_time for idle and iowait times if available

2012-03-30 15:43:33 +02:00

task_mmu.c

proc/smaps: show amount of nonlinear ptes in vma

2012-05-31 17:49:29 -07:00

task_nommu.c

proc: remove mm_for_maps()

2012-05-31 17:49:28 -07:00

uptime.c

Merge branch 'sched/core' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into cputime-tip

2011-12-19 19:23:15 +01:00

version.c

proc: switch /proc/version to seq_file

2008-10-23 14:19:58 +04:00

vmcore.c

fadump: Introduce cleanup routine to invalidate /proc/vmcore.

2012-02-23 10:50:02 +11:00