From 11648b8339f840d4b1f4c54a1abec8025d9e077d Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Sat, 1 Feb 2020 22:20:52 +0100 Subject: [PATCH] sparc64: fix adjtimex regression Anatoly Pugachev reported one of the y2038 patches to introduce a fatal bug from a stupid typo: [ 96.384129] watchdog: BUG: soft lockup - CPU#8 stuck for 22s! ... [ 96.385624] [0000000000652ca4] handle_mm_fault+0x84/0x320 [ 96.385668] [0000000000b6f2bc] do_sparc64_fault+0x43c/0x820 [ 96.385720] [0000000000407754] sparc64_realfault_common+0x10/0x20 [ 96.385769] [000000000042fa28] __do_sys_sparc_clock_adjtime+0x28/0x80 [ 96.385819] [00000000004307f0] sys_sparc_clock_adjtime+0x10/0x20 [ 96.385866] [0000000000406294] linux_sparc_syscall+0x34/0x44 Fix the code to dereference the correct pointer again. Reported-by: Anatoly Pugachev Tested-by: Anatoly Pugachev Fixes: 251ec1c159e4 ("y2038: sparc: remove use of struct timex") Signed-off-by: Arnd Bergmann Signed-off-by: David S. Miller --- arch/sparc/kernel/sys_sparc_64.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/sparc/kernel/sys_sparc_64.c b/arch/sparc/kernel/sys_sparc_64.c index 34917617f258..6b92fadb6ec7 100644 --- a/arch/sparc/kernel/sys_sparc_64.c +++ b/arch/sparc/kernel/sys_sparc_64.c @@ -551,7 +551,7 @@ out_unlock: SYSCALL_DEFINE1(sparc_adjtimex, struct __kernel_timex __user *, txc_p) { struct __kernel_timex txc; - struct __kernel_old_timeval *tv = (void *)&txc_p->time; + struct __kernel_old_timeval *tv = (void *)&txc.time; int ret; /* Copy the user data space into the kernel copy @@ -576,7 +576,7 @@ SYSCALL_DEFINE2(sparc_clock_adjtime, const clockid_t, which_clock, struct __kernel_timex __user *, txc_p) { struct __kernel_timex txc; - struct __kernel_old_timeval *tv = (void *)&txc_p->time; + struct __kernel_old_timeval *tv = (void *)&txc.time; int ret; if (!IS_ENABLED(CONFIG_POSIX_TIMERS)) { -- 2.11.0