Milan Broz f4808ca99a dm table: reject devices without request fns ... This patch adds a check that a block device has a request function defined before it is used. Otherwise, misconfiguration can cause an oops. Because we are allowing devices with zero size e.g. an offline multipath device as in commit 2cd54d9bed ("dm: allow offline devices") there needs to be an additional check to ensure devices are initialised. Some block devices, like a loop device without a backing file, exist but have no request function. Reproducer is trivial: dm-mirror on unbound loop device (no backing file on loop devices) dmsetup create x --table "0 8 mirror core 2 8 sync 2 /dev/loop0 0 /dev/loop1 0" and mirror resync will immediatelly cause OOps. BUG: unable to handle kernel NULL pointer dereference at (null) ? generic_make_request+0x2bd/0x590 ? kmem_cache_alloc+0xad/0x190 submit_bio+0x53/0xe0 ? bio_add_page+0x3b/0x50 dispatch_io+0x1ca/0x210 [dm_mod] ? read_callback+0x0/0xd0 [dm_mirror] dm_io+0xbb/0x290 [dm_mod] do_mirror+0x1e0/0x748 [dm_mirror] Signed-off-by: Milan Broz <mbroz@redhat.com> Reported-by: Zdenek Kabelac <zkabelac@redhat.com> Acked-by: Mike Snitzer <snitzer@redhat.com> Cc: stable@kernel.org Signed-off-by: Alasdair G Kergon <agk@redhat.com>		2011-05-29 13:02:52 +01:00
..
accessibility
acpi	Merge branch 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging	2011-05-25 16:52:50 -07:00
amba	ARM: 6829/1: amba: make hardcoded periphid override hardware	2011-05-26 10:33:34 +01:00
ata	Merge branch 'for-2.6.40/core' of git://git.kernel.dk/linux-2.6-block	2011-05-25 09:14:07 -07:00
atm	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6	2011-05-20 13:43:21 -07:00
auxdisplay
base	mm: per-node vmstat: show proper vmstats	2011-05-25 08:39:07 -07:00
bcma	drivers/bcma/host_pci.c needs slab.h	2011-05-26 17:12:32 -07:00
block	loop: export module parameters	2011-05-27 07:59:25 +02:00
bluetooth	Merge git://git.kernel.org/pub/scm/linux/kernel/git/brodo/pcmcia-2.6	2011-05-24 13:28:35 -07:00
cdrom	Merge commit 'v2.6.39' into for-2.6.40/core	2011-05-20 20:33:15 +02:00
char	drivers/char/ppdev.c: put gotten port value	2011-05-26 17:12:37 -07:00
clk
clocksource	Merge branch 'sh-latest' of git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6	2011-05-23 21:24:07 -07:00
connector
cpufreq	cpufreq: make DB8500 cpufreq driver compile	2011-05-24 22:20:14 +02:00
cpuidle
crypto	[S390] ap: skip device registration on type probe failure	2011-05-23 10:24:29 +02:00
dca
dio
dma	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx	2011-05-28 12:35:15 -07:00
edac	edac,rcu: use synchronize_rcu() instead of call_rcu()+rcu_barrier()	2011-05-26 17:12:37 -07:00
eisa
firewire
firmware	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2011-05-23 09:12:26 -07:00
gpio	Merge branch 'gpio/next' of git://git.secretlab.ca/git/linux-2.6	2011-05-28 10:56:34 -07:00
gpu	vmscan: change shrinker API by passing shrink_control struct	2011-05-25 08:39:26 -07:00
hid	Merge branch 'usb-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6	2011-05-23 12:33:02 -07:00
hwmon	hwmon: (coretemp) Fix section mismatch	2011-05-27 02:24:54 -07:00
hwspinlock
i2c	mfd: Use mfd cell platform_data for timberdale cells platform bits	2011-05-26 19:45:05 +02:00
ide	Merge branch 'for-2.6.40/core' of git://git.kernel.dk/linux-2.6-block	2011-05-25 09:14:07 -07:00
idle
ieee802154
infiniband	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband	2011-05-26 12:13:57 -07:00
input	input: Add support for Qualcomm PMIC8XXX power key	2011-05-26 19:45:54 +02:00
isdn	Merge branch 'trivial' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6	2011-05-26 13:19:00 -07:00
leds	leds: Add ASIC3 LED support	2011-05-26 19:45:46 +02:00
lguest
macintosh	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2011-05-23 09:12:26 -07:00
mca
md	dm table: reject devices without request fns	2011-05-29 13:02:52 +01:00
media	Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6	2011-05-27 10:14:22 -07:00
memstick
message	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2011-05-23 09:12:26 -07:00
mfd	mfd: Fix build breakage caused by tps65910 gpio directory move	2011-05-28 08:38:55 +02:00
misc	kgdbts: unify/generalize gdb breakpoint adjustment	2011-05-26 17:12:36 -07:00
mmc	Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm	2011-05-27 19:51:32 -07:00
mtd	Merge git://git.infradead.org/mtd-2.6	2011-05-27 20:06:53 -07:00
net	Merge git://git.infradead.org/mtd-2.6	2011-05-27 20:06:53 -07:00
nfc
nubus
of	Merge branch 'devicetree/arm-next' of git://git.secretlab.ca/git/linux-2.6 into devel-stable	2011-05-25 00:08:17 +01:00
oprofile	oprofile: Use linux/mutex.h	2011-05-24 12:45:59 +02:00
parisc
parport	Merge branch 'trivial' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6	2011-05-26 13:19:00 -07:00
pci	Merge branch 'drm-core-next' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6	2011-05-24 12:06:40 -07:00
pcmcia
platform	x86: remove 32-bit versions of readq()/writeq()	2011-05-25 08:39:44 -07:00
pnp
power	Merge git://git.infradead.org/battery-2.6	2011-05-27 10:12:35 -07:00
pps
ps3
ptp	ptp: Added a clock driver for the National Semiconductor PHYTER.	2011-05-23 13:10:23 -07:00
rapidio
regulator	regulator: Fix _regulator_get_voltage if get_voltage callback is NULL	2011-05-27 10:49:30 +01:00
rtc	drivers/rtc/rtc-mxc.c: remove defines already included in rtc.h	2011-05-26 17:12:33 -07:00
s390	[S390] irq: merge irq.c and s390_ext.c	2011-05-26 09:48:24 +02:00
sbus
scsi	scsi: fix scsi_proc new kernel-doc warning	2011-05-28 23:12:11 -07:00
sfi
sh	Merge branch 'sh/genirq-threading' into sh-latest	2011-05-23 11:36:14 +09:00
sn
spi	spi/spi_bfin_sport: new driver for a SPI bus via the Blackfin SPORT peripheral	2011-05-27 01:23:54 -06:00
ssb	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6	2011-05-20 13:43:21 -07:00
staging	Merge branch 'trivial' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6	2011-05-26 13:19:00 -07:00
target	[SCSI] target: Convert TASK_ATTR to scsi_tcq.h definitions	2011-05-24 13:03:56 -04:00
tc
telephony
thermal
tty	Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm	2011-05-27 19:51:32 -07:00
uio
usb	Merge branch 'for-usb-next' of git://git.kernel.org/pub/scm/linux/kernel/git/sarah/xhci	2011-05-28 12:36:15 -07:00
uwb
vhost
video	drivers/video/mb862xx/mb862xxfbdrv.c needs uaccess.h	2011-05-26 17:12:32 -07:00
virtio
vlynq
w1	w1: add Maxim/Dallas DS2780 Stand-Alone Fuel Gauge IC support	2011-05-26 17:12:38 -07:00
watchdog	mfd: Use mfd cell platform_data for rdc321x cells platform bits	2011-05-26 19:45:06 +02:00
xen	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/djm/tmem	2011-05-26 10:50:56 -07:00
zorro
Kconfig	ptp: Added a brand new class driver for ptp clocks.	2011-05-23 13:01:00 -07:00
Makefile	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx	2011-05-28 12:35:15 -07:00