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Al Viro 24dff96a37 fix misuses of f_count() in ppp and netlink 
we used to check for "nobody else could start doing anything with
that opened file" by checking that refcount was 2 or less - one
for descriptor table and one we'd acquired in fget() on the way to
wherever we are.  That was race-prone (somebody else might have
had a reference to descriptor table and do fget() just as we'd
been checking) and it had become flat-out incorrect back when
we switched to fget_light() on those codepaths - unlike fget(),
it doesn't grab an extra reference unless the descriptor table
is shared.  The same change allowed a race-free check, though -
we are safe exactly when refcount is less than 2.

It was a long time ago; pre-2.6.12 for ioctl() (the codepath leading
to ppp one) and 2.6.17 for sendmsg() (netlink one).  OTOH,
netlink hadn't grown that check until 3.9 and ppp used to live
in drivers/net, not drivers/net/ppp until 3.1.  The bug existed
well before that, though, and the same fix used to apply in old
location of file.

Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-10-09 02:39:17 -04:00
..
accessibility
acpi Merge branches 'acpi-hotplug', 'acpi-scan', 'acpi-lpss', 'acpi-gpio' and 'acpi-video' 2014-09-25 22:59:30 +02:00
amba
ata ahci_xgene: Fix the link down in first attempt for the APM X-Gene SoC AHCI SATA host controller driver. 2014-09-06 11:27:15 +09:00
atm Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-08-13 18:27:40 -06:00
auxdisplay
base regmap: Fix registers file debugfs 2014-09-15 16:20:56 -07:00
bcma bcma: add PCI ID for spromless BCM43217 2014-08-25 15:39:23 -04:00
block rsxx debugfs inanity 2014-10-09 02:39:07 -04:00
bluetooth switch hci_vhci to ->write_iter() 2014-10-09 02:39:08 -04:00
bus bus: omap_l3_noc: Fix connID for OMAP4 2014-09-11 10:43:39 -07:00
cdrom
char switch /dev/zero and /dev/full to ->read_iter() 2014-10-09 02:39:08 -04:00
clk clk/efm32gg: fix dt init prototype 2014-09-09 13:52:18 -07:00
clocksource ARM: SoC platform changes for 3.17 2014-08-08 11:14:29 -07:00
connector
cpufreq cpufreq: release policy->rwsem on error 2014-09-22 14:32:43 +02:00
cpuidle ARM: 8130/1: cpuidle/cpuidle-big_little: fix reading cpu id part number 2014-08-27 15:40:45 +01:00
crypto crypto: ccp - Check for CCP before registering crypto algs 2014-09-24 14:23:34 +08:00
dca
devfreq
dio
dma dmaengine: jz4740: Fix non-cyclic descriptor completion 2014-09-11 10:54:25 +05:30
dma-buf dma-buf: don't open-code atomic_long_read() 2014-10-09 02:39:07 -04:00
edac Merge branch 'linux_next' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-edac 2014-08-15 17:56:45 -06:00
eisa
extcon
firewire Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2014-08-06 09:38:14 -07:00
firmware Revert "efi/x86: efistub: Move shared dependencies to <asm/efi.h>" 2014-09-23 22:01:55 +01:00
fmc
gpio ACPI and power management fixes for 3.17-rc7 2014-09-25 15:25:52 -07:00
gpu nouveau: __iomem misannotations 2014-10-09 02:39:11 -04:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid 2014-08-27 09:38:06 -07:00
hsi HSI changes for the v3.17 series 2014-08-06 20:06:14 -07:00
hv Char / Misc driver patches for 3.17-rc1 2014-08-04 17:32:24 -07:00
hwmon hwmon: (tmp103) Fix resource leak bug in tmp103 temperature sensor driver 2014-09-22 11:11:48 -07:00
hwspinlock
i2c i2c: acpi: Fix NULL Pointer dereference 2014-09-25 16:08:15 +02:00
ide ide: use module_platform_driver() 2014-08-05 21:16:46 -07:00
idle intel_idle: Broadwell support 2014-08-15 17:06:40 -04:00
iio iio:magnetometer: bugfix magnetometers gain values 2014-09-14 18:21:23 +01:00
infiniband [infiniband] remove pointless assignments 2014-10-09 02:39:15 -04:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2014-09-26 11:04:31 -07:00
iommu iommu/fsl: Fix warning resulting from adding PCI device twice 2014-09-05 16:01:46 +02:00
ipack
irqchip irqchip: gic-v3: Declare rdist as __percpu pointer to __iomem pointer 2014-09-03 12:08:10 +00:00
isdn drivers: isdn: eicon: xdi_msg.h: Fix typo in #ifndef 2014-08-22 11:31:30 -07:00
leds Revert "leds: convert blink timer to workqueue" 2014-09-02 10:02:13 -07:00
lguest mm/vmalloc.c: clean up map_vm_area third argument 2014-08-06 18:01:19 -07:00
macintosh == Changes to existing drivers == 2014-08-07 17:23:16 -07:00
mailbox
mcb
md Bugfixes for md/raid1 2014-09-24 08:53:33 -07:00
media [media] em28xx-v4l: get rid of field "users" in struct em28xx_v4l2" 2014-09-21 21:27:57 -03:00
memory
memstick
message scsi: use 'depends' instead of 'select' for SCSI_FC_ATTRS 2014-09-16 16:55:55 -04:00
mfd mfd: twl4030-power: Fix PM idle pin configuration to not conflict with regulators 2014-08-28 15:57:55 +01:00
misc carma-fpga: switch to simple_read_from_buffer() 2014-10-09 02:39:06 -04:00
mmc PCI changes for the v3.17 merge window (part 2): 2014-08-14 18:10:33 -06:00
mtd Two trivial MTD updates for 3.17-rc4: 2014-09-06 12:12:09 -07:00
net fix misuses of f_count() in ppp and netlink 2014-10-09 02:39:17 -04:00
nfc NFC: st21nfca: Fix potential depmod dependency cycle 2014-09-07 23:45:53 +02:00
ntb ntb: Add alignment check to meet hardware requirement 2014-09-14 00:10:38 -04:00
nubus
of of/fdt: fix memory range check 2014-09-25 11:55:50 +01:00
oprofile
parisc parisc: pdc_stable.c: Avoid potential stack overflows 2014-09-21 22:31:08 +02:00
parport drivers/parport/parport_ip32.c: use PTR_ERR_OR_ZERO 2014-08-08 15:57:25 -07:00
pci PCI updates for v3.17: 2014-09-24 09:46:29 -07:00
pcmcia Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2014-08-07 08:50:34 -07:00
phy phy: spear1340-miphy: fix driver dependencies 2014-09-12 11:35:31 +05:30
pinctrl pinctrl: baytrail: resolve unbalanced IRQ wake disable warning 2014-09-10 14:25:51 +02:00
platform toshiba_acpi: fix and cleanup toshiba_kbd_bl_mode_store() 2014-09-03 10:45:12 -07:00
pnp
power ARM: SoC platform changes for 3.17 2014-08-08 11:14:29 -07:00
powercap powercap / RAPL: change domain detection message 2014-09-03 01:29:00 +02:00
pps
ps3
ptp PCI: Remove DEFINE_PCI_DEVICE_TABLE macro use 2014-08-12 12:15:14 -06:00
pwm pwm: Fix period and polarity in pwm_get() for non-perfect matches 2014-08-18 10:58:43 +02:00
rapidio PCI: Remove DEFINE_PCI_DEVICE_TABLE macro use 2014-08-12 12:15:14 -06:00
ras
regulator regulator: remove unnecessary of_node_get() to parent 2014-09-10 11:35:02 +01:00
remoteproc
reset
rpmsg
rtc drivers/rtc/rtc-efi.c: add missing module alias 2014-09-26 08:10:35 -07:00
s390 [s390] remove pointless assignment of ->f_op in vmlogrdr ->open() 2014-10-09 02:39:13 -04:00
sbus Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc 2014-08-05 18:57:18 -07:00
scsi Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-09-22 18:23:33 -07:00
sfi
sh sh: intc: Confine SH_INTC to platforms that need it 2014-08-22 12:28:16 +09:00
sn
soc drivers/soc: qcom: do not disable the iface clock in probe 2014-09-23 21:38:32 -07:00
spi Merge remote-tracking branches 'spi/fix/davinci', 'spi/fix/dw', 'spi/fix/fsl', 'spi/fix/pl022', 'spi/fix/rockchip' and 'spi/fix/sirf' into spi-linus 2014-09-16 16:20:19 -07:00
spmi
ssb ssb: add PCI ID 0x4351 2014-08-25 15:39:22 -04:00
staging android: ->f_op is never NULL 2014-10-09 02:39:12 -04:00
target iscsi-target: avoid NULL pointer in iscsi_copy_param_list failure 2014-09-17 13:44:01 -07:00
tc
thermal
thunderbolt thunderbolt: Clear hops before overwriting 2014-08-26 14:54:48 -07:00
tty tty: xuartps: Fix tx_emtpy() callback 2014-09-08 16:33:56 -07:00
uio
usb gadgetfs: saner API for gadgetfs_create_file() 2014-10-09 02:39:14 -04:00
uwb uwb: init beacon cache entry before registering uwb device 2014-09-08 16:03:21 -07:00
vfio drivers/vfio: Enable VFIO if EEH is not supported 2014-08-08 10:39:16 -06:00
vhost
video video: ARM CLCD: Fix color model capabilities for DT platforms 2014-09-12 11:45:10 +03:00
virt
virtio
vlynq
vme vme: bridges: use pci_zalloc_consistent 2014-08-08 15:57:30 -07:00
w1
watchdog Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2014-08-07 08:47:00 -07:00
xen xen: bug fixes for 3.17-rc4 2014-09-11 16:52:29 -07:00
zorro
Kconfig Char / Misc driver patches for 3.17-rc1 2014-08-04 17:32:24 -07:00
Makefile Driver core patches for 3.17-rc1 2014-08-04 18:34:04 -07:00