Ivan Delalande ea5751ccd6 proc/sysctl: don't return ENOMEM on lookup when a table is unregistering ...

proc_sys_lookup can fail with ENOMEM instead of ENOENT when the
corresponding sysctl table is being unregistered. In our case we see
this upon opening /proc/sys/net/*/conf files while network interfaces
are being deleted, which confuses our configuration daemon.

The problem was successfully reproduced and this fix tested on v4.9.122
and v4.20-rc6.

v2: return ERR_PTRs in all cases when proc_sys_make_inode fails instead
of mixing them with NULL. Thanks Al Viro for the feedback.

Fixes: ace0c791e6 ("proc/sysctl: Don't grab i_lock under sysctl_lock.")
Cc: stable@vger.kernel.org
Signed-off-by: Ivan Delalande <colona@arista.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

2018-12-13 20:59:44 -05:00

..

array.c

…

base.c

Merge tag 'stackleak-v4.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

2018-11-01 11:46:27 -07:00

cmdline.c

…

consoles.c

…

cpuinfo.c

…

devices.c

…

fd.c

…

fd.h

…

generic.c

proc: smaller readlock section in readdir("/proc")

2018-08-22 10:52:45 -07:00

inode.c

mm: zero-seek shrinkers

2018-10-26 16:26:33 -07:00

internal.h

proc: spread "const" a bit

2018-08-22 10:52:46 -07:00

interrupts.c

…

Kconfig

proc/kcore: add vmcoreinfo note to /proc/kcore

2018-08-22 10:52:46 -07:00

kcore.c

mm: remove include/linux/bootmem.h

2018-10-31 08:54:16 -07:00

kmsg.c

…

loadavg.c

sched: loadavg: consolidate LOAD_INT, LOAD_FRAC, CALC_LOAD

2018-10-26 16:26:32 -07:00

Makefile

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meminfo.c

mm, proc: add KReclaimable to /proc/meminfo

2018-10-26 16:26:32 -07:00

namespaces.c

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nommu.c

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page.c

mm: remove include/linux/bootmem.h

2018-10-31 08:54:16 -07:00

proc_net.c

…

proc_sysctl.c

proc/sysctl: don't return ENOMEM on lookup when a table is unregistering

2018-12-13 20:59:44 -05:00

proc_tty.c

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root.c

…

self.c

…

softirqs.c

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stat.c

proc: use "unsigned int" in /proc/stat hook

2018-08-22 10:52:46 -07:00

task_mmu.c

Merge branch 'xarray' of git://git.infradead.org/users/willy/linux-dax

2018-10-28 11:35:40 -07:00

task_nommu.c

mm: /proc/pid/*maps remove is_pid and related wrappers

2018-08-22 10:52:44 -07:00

thread_self.c

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uptime.c

fs/proc/uptime.c: use ktime_get_boottime_ts64

2018-08-22 10:52:45 -07:00

util.c

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version.c

…

vmcore.c

mm: remove include/linux/bootmem.h

2018-10-31 08:54:16 -07:00