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Janosch Frank 3921d5b8a1 s390/mm: Check for valid vma before zapping in gmap_discard 
commit 1843abd032 upstream.

Userspace could have munmapped the area before doing unmapping from
the gmap. This would leave us with a valid vmaddr, but an invalid vma
from which we would try to zap memory.

Let's check before using the vma.

Fixes: 1e133ab296 ("s390/mm: split arch/s390/mm/pgtable.c")
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Message-Id: <20180816082432.78828-1-frankja@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-12-01 09:46:41 +01:00
..
alpha arch/alpha, termios: implement BOTHER, IBSHIFT and termios2 2018-11-21 09:27:42 +01:00
arc ARC: build: Get rid of toolchain check 2018-10-20 09:52:38 +02:00
arm ARM: dts: imx53-qsb: disable 1.2GHz OPP 2018-11-10 07:41:40 -08:00
arm64 arm64: remove no-op -p linker flag 2018-12-01 09:46:36 +01:00
avr32 avr32: off by one in at32_init_pio() 2016-10-07 15:23:45 +02:00
blackfin pinctrl: adi2: Fix Kconfig build problem 2017-12-20 10:05:00 +01:00
c6x c6x/ptrace: Remove useless PTRACE_SETREGSET implementation 2017-03-31 09:49:53 +02:00
cris cris: Only build flash rescue image if CONFIG_ETRAX_AXISFLASHMAP is selected 2017-01-12 11:22:48 +01:00
frv futex: Remove duplicated code and fix undefined behaviour 2018-05-26 08:48:50 +02:00
h8300 h8300/ptrace: Fix incorrect register transfer count 2017-03-31 09:49:53 +02:00
hexagon hexagon: modify ffs() and fls() to return int 2018-10-10 08:52:12 +02:00
ia64 kbuild: Consolidate header generation from ASM offset information 2018-11-27 16:07:57 +01:00
m32r m32r: fix __get_user() 2016-09-24 10:07:43 +02:00
m68k m68k: fix "bad page state" oops on ColdFire boot 2018-08-24 13:26:57 +02:00
metag metag/uaccess: Check access_ok in strncpy_from_user 2017-05-25 14:30:16 +02:00
microblaze microblaze: Fix simpleImage format generation 2018-08-06 16:24:39 +02:00
mips MIPS: Loongson-3: Fix BRIDGE irq delivery problem 2018-11-21 09:27:41 +01:00
mn10300 mn10300/misalignment: Use SIGSEGV SEGV_MAPERR to report a failed user copy 2018-02-16 20:09:47 +01:00
nios2 nios2: reserve boot memory for device tree 2017-04-12 12:38:34 +02:00
openrisc kthread: fix boot hang (regression) on MIPS/OpenRISC 2018-09-19 22:48:55 +02:00
parisc parisc: Fix map_pages() to not overwrite existing pte entries 2018-11-21 09:27:30 +01:00
powerpc powerpc/numa: Suppress "VPHN is not supported" messages 2018-12-01 09:46:35 +01:00
s390 s390/mm: Check for valid vma before zapping in gmap_discard 2018-12-01 09:46:41 +01:00
score score: fix copy_from_user() and friends 2016-09-24 10:07:44 +02:00
sh sh: New gcc support 2018-06-06 16:46:20 +02:00
sparc sparc: Fix single-pcr perf event counter management. 2018-11-21 09:27:30 +01:00
tile futex: Remove duplicated code and fix undefined behaviour 2018-05-26 08:48:50 +02:00
um um: Give start_idle_thread() a return code 2018-11-27 16:08:00 +01:00
unicore32 pwm: Changes for v4.4-rc1 2015-11-11 09:16:10 -08:00
x86 x86/entry/64: Remove %ebx handling from error_entry/exit 2018-12-01 09:46:36 +01:00
xtensa xtensa: fix boot parameters address translation 2018-11-21 09:27:41 +01:00
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