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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: a9446a906f ("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
This commit is contained in:
Thomas Gleixner 2019-10-21 12:07:15 +02:00
parent 7d194c2100
commit 1638b8f096
1 changed files with 5 additions and 4 deletions
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9
lib/vdso/gettimeofday.c
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@ -214,9 +214,10 @@ int __cvdso_clock_getres_common(clockid_t clock, struct __kernel_timespec *res)
return -1; return -1;
} }
res->tv_sec = 0; if (likely(res)) {
res->tv_nsec = ns; res->tv_sec = 0;
res->tv_nsec = ns;
}
return 0; return 0;
} }
@ -245,7 +246,7 @@ __cvdso_clock_getres_time32(clockid_t clock, struct old_timespec32 *res)
ret = clock_getres_fallback(clock, &ts); ret = clock_getres_fallback(clock, &ts);
#endif #endif
if (likely(!ret)) { if (likely(!ret && res)) {
res->tv_sec = ts.tv_sec; res->tv_sec = ts.tv_sec;
res->tv_nsec = ts.tv_nsec; res->tv_nsec = ts.tv_nsec;
} }