Tetsuo Handa 8e04944f0e mm,vmscan: Allow preallocating memory for register_shrinker(). ... syzbot is catching so many bugs triggered by commit 9ee332d99e ("sget(): handle failures of register_shrinker()"). That commit expected that calling kill_sb() from deactivate_locked_super() without successful fill_super() is safe, but the reality was different; some callers assign attributes which are needed for kill_sb() after sget() succeeds. For example, [1] is a report where sb->s_mode (which seems to be either FMODE_READ | FMODE_EXCL | FMODE_WRITE or FMODE_READ | FMODE_EXCL) is not assigned unless sget() succeeds. But it does not worth complicate sget() so that register_shrinker() failure path can safely call kill_block_super() via kill_sb(). Making alloc_super() fail if memory allocation for register_shrinker() failed is much simpler. Let's avoid calling deactivate_locked_super() from sget_userns() by preallocating memory for the shrinker and making register_shrinker() in sget_userns() never fail. [1] https://syzkaller.appspot.com/bug?id=588996a25a2587be2e3a54e8646728fb9cae44e7 Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Reported-by: syzbot <syzbot+5a170e19c963a2e0df79@syzkaller.appspotmail.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Michal Hocko <mhocko@suse.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>		2018-04-16 02:06:47 -04:00
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acpi	xen: fixes for 4.17-rc1	2018-04-12 11:04:35 -07:00
asm-generic	asm-generic fixes for v4.17-rc1	2018-04-12 09:15:48 -07:00
clocksource	ARM: SoC platform updates for 4.17	2018-04-05 21:21:08 -07:00
crypto	crypto: api - Remove unused crypto_type lookup function	2018-03-31 01:32:57 +08:00
drm
dt-bindings	The large diff this time around is from the addition of a new clk driver	2018-04-13 15:51:06 -07:00
keys
kvm
linux	mm,vmscan: Allow preallocating memory for register_shrinker().	2018-04-16 02:06:47 -04:00
math-emu
media	media updates for v4.17-rc1	2018-04-10 10:10:30 -07:00
memory
misc
net	slip: Check if rstate is initialized before uncompressing	2018-04-11 10:33:46 -04:00
pcmcia
ras
rdma	Merge candidates for 4.17 merge window	2018-04-06 17:35:43 -07:00
scsi	SCSI for-linus on 20180404	2018-04-05 15:05:53 -07:00
soc	ARM: SoC driver updates for 4.17	2018-04-05 21:29:35 -07:00
sound	sound updates for 4.17-rc1	2018-04-05 10:42:07 -07:00
target
trace	NFS client updates for Linux 4.17	2018-04-12 12:55:50 -07:00
uapi	Merge branch 'parisc-4.17-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux	2018-04-12 17:07:04 -07:00
video
xen	xen/pvh: Indicate XENFEAT_linux_rsdp_unrestricted to Xen	2018-04-10 09:22:22 -04:00