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posix-timers: Accept NULL clock_getres() output in stubs

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With CONFIG_POSIX_TIMERS disabled, clock_getres() returns -EFAULT for a
supported clock when the result pointer is NULL. POSIX permits a NULL
result pointer to suppress returning the clock resolution.

Only copy the result when a destination is provided, in both the native
and time32 stubs. This matches the full POSIX timer implementation and
preserves clock ID validation.

Fixes: baa73d9e47 ("posix-timers: Make them configurable")
Fixes: d822cdcce4 ("posix-timers: Move compat versions of clock_gettime/settime/getres")
Signed-off-by: Hungyu Lin <dennylin0707@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20261020161121.85042-1-dennylin0707@gmail.com
This commit is contained in:
Hungyu Lin 2026-10-20 16:11:21 +00:00 committed by Thomas Gleixner
parent bd09134697
commit 5b819071e4
1 changed files with 2 additions and 2 deletions
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4
kernel/time/posix-stubs.c
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@ -83,7 +83,7 @@ SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock, struct __kernel_time
case CLOCK_REALTIME:
case CLOCK_MONOTONIC:
case CLOCK_BOOTTIME:
if (put_timespec64(&rtn_tp, tp))
if (tp && put_timespec64(&rtn_tp, tp))
return -EFAULT;
return 0;
default:
@ -166,7 +166,7 @@ SYSCALL_DEFINE2(clock_getres_time32, clockid_t, which_clock,
case CLOCK_REALTIME:
case CLOCK_MONOTONIC:
case CLOCK_BOOTTIME:
if (put_old_timespec32(&rtn_tp, tp))
if (tp && put_old_timespec32(&rtn_tp, tp))
return -EFAULT;
return 0;
default: