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authorThomas Gleixner <tglx@linutronix.de>2019-10-21 13:07:15 +0300
committerThomas Gleixner <tglx@linutronix.de>2019-10-23 15:48:23 +0300
commit1638b8f096ca165965189b9626564c933c79fe63 (patch)
treea43ee45ed5880772fb34a48991aea62d9b781303 /lib
parent7d194c2100ad2a6dded545887d02754948ca5241 (diff)
downloadlinux-1638b8f096ca165965189b9626564c933c79fe63.tar.xz
lib/vdso: Make clock_getres() POSIX compliant again
A recent commit removed the NULL pointer check from the clock_getres() implementation causing a test case to fault. POSIX requires an explicit NULL pointer check for clock_getres() aside of the validity check of the clock_id argument for obscure reasons. Add it back for both 32bit and 64bit. Note, this is only a partial revert of the offending commit which does not bring back the broken fallback invocation in the the 32bit compat implementations of clock_getres() and clock_gettime(). Fixes: a9446a906f52 ("lib/vdso/32: Remove inconsistent NULL pointer checks") Reported-by: Andreas Schwab <schwab@linux-m68k.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Christophe Leroy <christophe.leroy@c-s.fr> Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/alpine.DEB.2.21.1910211202260.1904@nanos.tec.linutronix.de
Diffstat (limited to 'lib')
-rw-r--r--lib/vdso/gettimeofday.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/lib/vdso/gettimeofday.c b/lib/vdso/gettimeofday.c
index e630e7ff57f1..45f57fd2db64 100644
--- a/lib/vdso/gettimeofday.c
+++ b/lib/vdso/gettimeofday.c
@@ -214,9 +214,10 @@ int __cvdso_clock_getres_common(clockid_t clock, struct __kernel_timespec *res)
return -1;
}
- res->tv_sec = 0;
- res->tv_nsec = ns;
-
+ if (likely(res)) {
+ res->tv_sec = 0;
+ res->tv_nsec = ns;
+ }
return 0;
}
@@ -245,7 +246,7 @@ __cvdso_clock_getres_time32(clockid_t clock, struct old_timespec32 *res)
ret = clock_getres_fallback(clock, &ts);
#endif
- if (likely(!ret)) {
+ if (likely(!ret && res)) {
res->tv_sec = ts.tv_sec;
res->tv_nsec = ts.tv_nsec;
}