Xiaotian Feng a2ef990ab5 proc: fix null pointer deref in proc_pid_permission() ... get_proc_task() can fail to search the task and return NULL, put_task_struct() will then bomb the kernel with following oops: BUG: unable to handle kernel NULL pointer dereference at 0000000000000010 IP: [<ffffffff81217d34>] proc_pid_permission+0x64/0xe0 PGD 112075067 PUD 112814067 PMD 0 Oops: 0002 [#1] PREEMPT SMP This is a regression introduced by commit 0499680a ("procfs: add hidepid= and gid= mount options"). The kernel should return -ESRCH if get_proc_task() failed. Signed-off-by: Xiaotian Feng <dannyfeng@tencent.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Vasiliy Kulikov <segoon@openwall.com> Cc: Stephen Wilson <wilsons@start.ca> Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2012-01-12 20:13:02 -08:00
..
array.c	[S390] cputime: add sparse checking and cleanup	2011-12-15 14:56:19 +01:00
base.c	proc: fix null pointer deref in proc_pid_permission()	2012-01-12 20:13:02 -08:00
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	switch procfs to umode_t use	2012-01-03 22:54:56 -05:00
inode.c	procfs: add hidepid= and gid= mount options	2012-01-10 16:30:54 -08:00
internal.h	procfs: parse mount options	2012-01-10 16:30:54 -08:00
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	/proc/kcore: fix seeking	2011-01-13 08:03:17 -08:00
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	vfs: trim includes a bit	2012-01-03 22:57:13 -05:00
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	thp: remove PG_buddy	2011-01-13 17:32:43 -08:00
proc_devtree.c	of/flattree: Drop an uninteresting message to pr_debug level	2011-03-02 13:45:18 -07:00
proc_net.c	switch procfs to umode_t use	2012-01-03 22:54:56 -05:00
proc_sysctl.c	Merge branch 'akpm' (Andrew's incoming - part two)	2011-11-02 16:07:27 -07:00
proc_tty.c	proc: use seq_puts()/seq_putc() where possible	2011-01-13 08:03:16 -08:00
root.c	procfs: add hidepid= and gid= mount options	2012-01-10 16:30:54 -08:00
softirqs.c	proc: use seq_puts()/seq_putc() where possible	2011-01-13 08:03:16 -08:00
stat.c	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2012-01-06 08:44:54 -08:00
task_mmu.c	mm: distinguish between mlocked and pinned pages	2011-10-31 17:30:46 -07:00
task_nommu.c	report errors in /proc/*/*map* sanely	2011-03-23 16:36:50 -04:00
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	fs: add export.h to files using EXPORT_SYMBOL/THIS_MODULE macros	2011-10-31 19:30:31 -04:00