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| author | Thomas Gleixner <tglx@linutronix.de> | 2019-10-21 12:07:15 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2019-10-23 14:48:23 +0200 |
| commit | 1638b8f096ca165965189b9626564c933c79fe63 (patch) | |
| tree | a43ee45ed5880772fb34a48991aea62d9b781303 /lib/vdso | |
| parent | 7d194c2100ad2a6dded545887d02754948ca5241 (diff) | |
| download | lwn-1638b8f096ca165965189b9626564c933c79fe63.tar.gz lwn-1638b8f096ca165965189b9626564c933c79fe63.zip | |
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/vdso')
| -rw-r--r-- | lib/vdso/gettimeofday.c | 9 |
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; } |