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Joel Fernandes be105de753 staging: android: ashmem: Fix lockdep issue during llseek 
commit cb57469c9573f6018cd1302953dd45d6e05aba7b upstream.

ashmem_mutex create a chain of dependencies like so:

(1)
mmap syscall ->
  mmap_sem ->  (acquired)
  ashmem_mmap
  ashmem_mutex (try to acquire)
  (block)

(2)
llseek syscall ->
  ashmem_llseek ->
  ashmem_mutex ->  (acquired)
  inode_lock ->
  inode->i_rwsem (try to acquire)
  (block)

(3)
getdents ->
  iterate_dir ->
  inode_lock ->
  inode->i_rwsem   (acquired)
  copy_to_user ->
  mmap_sem         (try to acquire)

There is a lock ordering created between mmap_sem and inode->i_rwsem
causing a lockdep splat [2] during a syzcaller test, this patch fixes
the issue by unlocking the mutex earlier. Functionally that's Ok since
we don't need to protect vfs_llseek.

[1] https://patchwork.kernel.org/patch/10185031/
[2] https://lkml.org/lkml/2018/1/10/48

Acked-by: Todd Kjos <tkjos@google.com>
Cc: Arve Hjonnevag <arve@android.com>
Reported-by: syzbot+8ec30bb7bf1a981a2012@syzkaller.appspotmail.com
Signed-off-by: Joel Fernandes <joelaf@google.com>
Acked-by: Greg Hackmann <ghackmann@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
 		2019-07-27 21:49:47 +02:00
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accessibility
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acpi ACPI: APEI / ERST: Fix missing error handling in erst_reader() 2019-07-27 21:46:19 +02:00
amba
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android ANDROID: binder: add hwbinder,vndbinder to BINDER_DEVICES. 2018-02-06 13:12:16 +01:00
ata libata: array underflow in ata_find_dev() 2019-07-27 21:44:15 +02:00
atm
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auxdisplay
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base power: align wakeup_sources format 2019-07-27 21:47:56 +02:00
battery Import T813XXS2BRC2 kernel source changes 2018-05-26 00:39:42 +02:00
battery_v2 Import latest Samsung release 2017-04-18 03:43:52 +02:00
bcma
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bif
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block UPSTREAM: block: disable entropy contributions for nonrot devices 2019-07-27 21:47:56 +02:00
bluetooth Merge tag 'LA.BR.1.3.6-05410-8976.0' of https://source.codeaurora.org/quic/la/kernel/msm-3.10 into HEAD 2018-02-06 13:11:45 +01:00
bus
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cdrom BACKPORT: block: add blk_rq_set_block_pc() 2017-04-22 23:03:01 +02:00
char diag: dci: check signed values for negativity 2019-07-27 21:49:31 +02:00
clk clk: qcom: Remove unnecessary WARN 2019-07-27 21:45:56 +02:00
clocksource Merge tag 'LA.BR.1.3.6-05410-8976.0' of https://source.codeaurora.org/quic/la/kernel/msm-3.10 into HEAD 2018-02-06 13:11:45 +01:00
connector
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coresight coresight: tmc: Fix use after free issue with tmc read 2017-07-30 10:34:00 -07:00
cpufreq cpufreq: s3c2416: double free on driver init error path 2019-07-27 21:44:36 +02:00
cpuidle cpuidle: Remove unnecessary WARN for calculate_residency 2019-07-27 21:45:56 +02:00
crypto crypto: hash - annotate algorithms taking optional key 2019-07-27 21:49:17 +02:00
dca
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debug Import latest Samsung release 2017-04-18 03:43:52 +02:00
debug_32 Import latest Samsung release 2017-04-18 03:43:52 +02:00
devfreq devfreq_devbw: Assign labels to devbw nodes. 2017-04-18 12:24:57 +02:00
dio
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dma Merge remote-tracking branch 'f2fs/linux-3.10.y' into HEAD 2017-04-18 17:02:28 +02:00
edac This is the 3.10.102 stable release 2017-04-18 17:22:08 +02:00
eisa
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esoc
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extcon Import latest Samsung release 2017-04-18 03:43:52 +02:00
fingerprint drivers: fingerprint: Kill FEATURE_SPI_WAKELOCK 2017-04-19 17:02:36 +02:00
firewire This is the 3.10.95 stable release 2017-04-18 17:14:54 +02:00
firmware Import T813XXU2BQD1 kernel source changes 2017-04-22 16:30:03 +02:00
gpio gpio: Handle EPROBE_DEFER while probing 2019-07-27 21:45:55 +02:00
gpu msm: kgsl: Properly remove ref count on gpuobj_sync failure 2019-07-27 21:49:28 +02:00
hid HID: i2c-hid: allocate hid buffers for real worst case 2019-07-27 21:45:51 +02:00
hsi
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hv
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hwmon This is the 3.10.102 stable release 2017-04-18 17:22:08 +02:00
hwspinlock
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i2c i2c: core-smbus: prevent stack corruption on read I2C_BLOCK_DATA 2019-07-27 21:46:30 +02:00
ide UPSTREAM: block: disable entropy contributions for nonrot devices 2019-07-27 21:47:56 +02:00
idle
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iio iio: adis_lib: Initialize trigger before requesting interrupt 2019-07-27 21:46:10 +02:00
infiniband
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input input: synaptics_dsx: remove unused synaptics touch screen driver files 2019-07-27 21:46:00 +02:00
iommu iommu/amd: Finish TLB flush in amd_iommu_unmap() 2019-07-27 21:44:19 +02:00
ipack
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irqchip Import latest Samsung release 2017-04-18 03:43:52 +02:00
isdn
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leds Merge tag 'LA.BR.1.3.6-03510-8976.0' into HEAD 2017-04-18 12:11:50 +02:00
lguest Import latest Samsung release 2017-04-18 03:43:52 +02:00
macintosh
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mailbox
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md UPSTREAM: block: disable entropy contributions for nonrot devices 2019-07-27 21:47:56 +02:00
media msm: sensor: actuator: check NULL pointer for actuator ctrl 2019-07-27 21:49:15 +02:00
memory
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memstick
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message
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mfd mfd: omap-usb-tll: Fix inverted bit use for USB TLL mode 2019-07-27 21:44:34 +02:00
misc qseecom: Fix typo in format specifier 2019-07-27 21:44:44 +02:00
mmc UPSTREAM: block: disable entropy contributions for nonrot devices 2019-07-27 21:47:56 +02:00
motor Import latest Samsung release 2017-04-18 03:43:52 +02:00
mtd UPSTREAM: block: disable entropy contributions for nonrot devices 2019-07-27 21:47:56 +02:00
muic Import T813XXS2BRC2 kernel source changes 2018-05-26 00:39:42 +02:00
net qcacld-2.0: Sanity check for ssid length in limLookupNaddHashEntry 2019-07-27 21:49:39 +02:00
nfc Import latest Samsung release 2017-04-18 03:43:52 +02:00
ntb
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nubus
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of of: fdt: add missing allocation-failure check 2019-07-27 21:44:47 +02:00
oprofile
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parisc
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parport
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pci PCI / PM: Force devices to D0 in pci_pm_thaw_noirq() 2019-07-27 21:46:19 +02:00
pcmcia
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phy
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pinctrl pinctrl: Really force states during suspend/resume 2019-07-27 21:49:40 +02:00
platform Merge tag 'LA.BR.1.3.6-05410-8976.0' of https://source.codeaurora.org/quic/la/kernel/msm-3.10 into HEAD 2018-02-06 13:11:45 +01:00
pnp
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power angler: remove 'reboot edl' interface for security 2018-05-26 00:39:32 +02:00
pps
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ps3
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ptp
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pwm
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rapidio
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regulator Merge remote-tracking branch 'f2fs/linux-3.10.y' into HEAD 2017-04-18 17:02:28 +02:00
remoteproc
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reset
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rpmsg
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rtc rtc: set the alarm to the next expiring timer 2019-07-27 21:46:00 +02:00
s390 UPSTREAM: block: disable entropy contributions for nonrot devices 2019-07-27 21:47:56 +02:00
sbus
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scsi UPSTREAM: block: disable entropy contributions for nonrot devices 2019-07-27 21:47:56 +02:00
sensorhub Import T713XXU2BQD3 kernel source changes 2017-07-01 12:51:07 +02:00
sensors Import latest Samsung release 2017-04-18 03:43:52 +02:00
sfi
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sh
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slimbus slim-msm: Synchronize SSR callbacks 2017-05-05 19:20:28 +00:00
sn
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soc ASoC: apr: Add validity check to APR port 2018-08-20 12:08:44 +02:00
soundwire
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spi This is the 3.10.97 stable release 2017-04-18 17:17:20 +02:00
spmi Merge tag 'LA.BR.1.3.6-03510-8976.0' into HEAD 2017-04-18 12:11:50 +02:00
ssb
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ssbi
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staging staging: android: ashmem: Fix lockdep issue during llseek 2019-07-27 21:49:47 +02:00
switch
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target target: Avoid mappedlun symlink creation during lun shutdown 2019-07-27 21:44:16 +02:00
tc
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thermal msm_thermal: Handle defer while probing 2019-07-27 21:45:58 +02:00
tty tty: make n_tty_read() always abort if hangup is in progress 2019-07-27 21:49:23 +02:00
uio uio: fix dmem_region_start computation 2019-07-27 21:42:50 +02:00
usb BACKPORT: USB: core: harden cdc_parse_cdc_header 2019-07-27 21:48:08 +02:00
uwb
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vfio
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vhost Merge remote-tracking branch 'f2fs/linux-3.10.y' into HEAD 2017-04-18 17:02:28 +02:00
video msm: mdss: adjust mdss_mdp_get_plane_sizes parameters init order 2019-07-27 21:49:14 +02:00
virt
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virtio
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vlynq
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vme
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w1
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watchdog
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xen This is the 3.10.96 stable release 2017-04-18 17:16:02 +02:00
zorro
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Kconfig msm: gud: Remove gud driver 2017-09-08 18:49:12 +00:00
Makefile msm: gud: Remove gud driver 2017-09-08 18:49:12 +00:00