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Liam Mark 31eb79db42 staging: android: ion: Support cpu access during dma_buf_detach 
Often userspace doesn't know when the kernel will be calling dma_buf_detach
on the buffer.
If userpace starts its CPU access at the same time as the sg list is being
freed it could end up accessing the sg list after it has been freed.

Thread A				Thread B
- DMA_BUF_IOCTL_SYNC IOCT
 - ion_dma_buf_begin_cpu_access
  - list_for_each_entry
					- ion_dma_buf_detatch
					 - free_duped_table
   - dma_sync_sg_for_cpu

Fix this by getting the ion_buffer lock before freeing the sg table memory.

Fixes: 2a55e7b5e5 ("staging: android: ion: Call dma_map_sg for syncing and mapping")
Signed-off-by: Liam Mark <lmark@codeaurora.org>
Acked-by: Laura Abbott <labbott@redhat.com>
Acked-by: Andrew F. Davis <afd@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2019-01-22 11:38:09 +01:00
..
android staging: android: ion: Support cpu access during dma_buf_detach 2019-01-22 11:38:09 +01:00
axis-fifo staging: axis-fifo: Split line to stay in 80 characters. 2018-11-20 10:59:30 +01:00
board
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clocking-wizard staging: clocking-wizard: match parenthesis indentation 2018-10-09 14:57:33 +02:00
comedi Remove 'type' argument from access_ok() function 2019-01-03 18:57:57 -08:00
emxx_udc staging: emxx_udc: Remove cast and move all in one line. 2018-12-05 09:44:10 +01:00
erofs staging: erofs: Fix spelling issue 2018-12-12 11:30:05 +01:00
fbtft staging: fbtft: fix strncmp() size warning 2018-12-19 08:29:28 +01:00
fsl-dpaa2 net: core: dev: Add extack argument to dev_open() 2018-12-06 13:26:06 -08:00
fwserial staging: fwserial: convert to DEFINE_SHOW_ATTRIBUTE 2018-12-17 14:24:07 +01:00
gasket staging: gasket: formatting fixes 2018-11-12 14:43:15 -08:00
gdm724x staging: gdm724x: redundant variables idProduct and idVendor 2018-07-11 13:12:34 +02:00
goldfish staging: goldfish: Add SPDX license identifier. 2018-11-07 12:27:33 +01:00
greybus staging: greybus: convert to DEFINE_SHOW_ATTRIBUTE 2018-12-17 14:24:42 +01:00
gs_fpgaboot
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iio Revert "Staging: iio: adt7316: Add an extra check for 'ret' equals to 0" 2018-12-08 11:15:54 +00:00
ks7010 staging: ks7010: remove unnecessary blank line 2018-11-07 12:35:10 +01:00
media Staging/IIO driver patches for 4.21-rc1 2018-12-28 20:39:58 -08:00
most staging: most: sound: replace snprintf with strscpy 2018-12-19 08:28:22 +01:00
mt7621-dma staging: mt7621-dma: fix unbalanced braces 2018-12-17 14:17:28 +01:00
mt7621-dts staging: mt7621-dts: avoid warnings in pinctrl definitions 2018-12-12 11:55:39 +01:00
mt7621-eth cross-tree: phase out dma_zalloc_coherent() 2019-01-08 07:58:37 -05:00
mt7621-mmc staging: mt7621-mmc: Correct spelling mistakes in comments 2018-12-20 18:11:58 +01:00
mt7621-pci staging: mt7621-pci: add comment clarifying inverted reset lines 2018-12-05 09:39:45 +01:00
mt7621-pinctrl staging: mt7621-pinctrl: fix uninitialized variable ngroups 2018-11-11 11:47:38 -08:00
mt7621-spi staging: mt7621-spi: drop support for SPI mode 1/2/3 2018-12-12 11:34:53 +01:00
netlogic net: Add generic ndo_select_queue functions 2018-07-09 13:15:34 -07:00
nvec
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octeon Staging/IIO driver patches for 4.21-rc1 2018-12-28 20:39:58 -08:00
octeon-usb staging: octeon-usb: use a helper function to set the DMA mask 2018-12-05 09:47:02 +01:00
olpc_dcon staging: olpc_dcon: olpc_dcon_xo_1.c: Switch to the gpio descriptor interface 2018-11-08 03:59:47 -08:00
pi433 staging: pi433: add missing call to cdev_del() 2018-12-05 09:39:45 +01:00
rtl8188eu staging: rtl8188eu: Add device code for D-Link DWA-121 rev B1 2019-01-15 16:31:09 +01:00
rtl8192e Staging/IIO driver patches for 4.21-rc1 2018-12-28 20:39:58 -08:00
rtl8192u Staging/IIO driver patches for 4.21-rc1 2018-12-28 20:39:58 -08:00
rtl8712 Merge 4.20-rc6 into staging-next 2018-12-10 09:23:50 +01:00
rtl8723bs staging: rtl8723bs: Fix build error with Clang when inlining is disabled 2019-01-18 10:28:44 +01:00
rtlwifi staging: rtlwifi: fix spelling mistake "disnabled" -> "disabled" 2018-12-05 09:39:45 +01:00
rts5208 Staging/IIO driver patches for 4.21-rc1 2018-12-28 20:39:58 -08:00
sm750fb staging: sm750fb: Add spaces around '+' 2018-11-07 12:35:10 +01:00
speakup staging: speakup: change semaphore to completion 2018-12-12 11:31:14 +01:00
unisys Staging/IIO driver patches for 4.21-rc1 2018-12-28 20:39:58 -08:00
vboxvideo Staging/IIO driver patches for 4.21-rc1 2018-12-28 20:39:58 -08:00
vc04_services staging: vchiq: Fix local event signalling 2019-01-15 16:31:09 +01:00
vme
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vt6655 cross-tree: phase out dma_zalloc_coherent() 2019-01-08 07:58:37 -05:00
vt6656 staging: vt6655: remove some redundant variables 2018-07-11 14:47:08 +02:00
wilc1000 Staging: wilc1000: unlock on error in init_chip() 2019-01-15 16:31:09 +01:00
wlan-ng staging: wlan-ng: remove unused variable in prism2fw.c 2018-11-20 10:59:30 +01:00
xgifb staging: xgifb: clean an indentation issue 2018-11-07 12:35:10 +01:00
Kconfig staging: Remove the mt29f_spinand driver 2018-11-06 10:18:48 +01:00
Makefile staging: Remove the mt29f_spinand driver 2018-11-06 10:18:48 +01:00