Revision 9c1c2b35f1d94de8325344c2777d7ee67492db3b authored by Jeff Layton on 03 April 2019, 17:16:01 UTC, committed by Ilya Dryomov on 21 January 2020, 18:02:37 UTC
Currently, we just assume that it will stick around by virtue of the submitter's reference, but later patches will allow the syscall to return early and we can't rely on that reference at that point. While I'm not aware of any reports of it, Xiubo pointed out that this may fix a use-after-free. If the wait for a reply times out or is canceled via signal, and then the reply comes in after the syscall returns, the client can end up trying to access r_parent without a reference. Take an extra reference to the inode when setting r_parent and release it when releasing the request. Cc: stable@vger.kernel.org Signed-off-by: Jeff Layton <jlayton@kernel.org> Reviewed-by: "Yan, Zheng" <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
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Kconfig
# SPDX-License-Identifier: GPL-2.0
if MACH_PIC32
choice
prompt "Machine Type"
config PIC32MZDA
bool "Microchip PIC32MZDA Platform"
select BOOT_ELF32
select BOOT_RAW
select CEVT_R4K
select CSRC_R4K
select DMA_NONCOHERENT
select SYS_HAS_CPU_MIPS32_R2
select SYS_HAS_EARLY_PRINTK
select SYS_SUPPORTS_32BIT_KERNEL
select SYS_SUPPORTS_LITTLE_ENDIAN
select GPIOLIB
select COMMON_CLK
select CLKDEV_LOOKUP
select LIBFDT
select USE_OF
select PINCTRL
select PIC32_EVIC
help
Support for the Microchip PIC32MZDA microcontroller.
This is a 32-bit microcontroller with support for external or
internally packaged DDR2 memory up to 128MB.
For more information, see <http://www.microchip.com/>.
endchoice
choice
prompt "Devicetree selection"
default DTB_PIC32_NONE
help
Select the devicetree.
config DTB_PIC32_NONE
bool "None"
config DTB_PIC32_MZDA_SK
bool "PIC32MZDA Starter Kit"
depends on PIC32MZDA
select BUILTIN_DTB
endchoice
endif # MACH_PIC32
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