linux-kernel - [GIT pull] timers/urgent for v5.15-rc3

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Date:   Sun, 26 Sep 2021 12:30:07 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org
Subject: [GIT pull] timers/urgent for v5.15-rc3

Linus,

please pull the latest timers/urgent branch from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git timers-urgent-2021-09-26

up to:  8cd9da85d2bd: posix-cpu-timers: Prevent spuriously armed 0-value itimer


A single fix for the recently introduced regression in posix CPU timers
which failed to stop the timer when requested. That caused unexpected
signals to be sent to the process/thread causing malfunction.

Thanks,

	tglx

------------------>
Frederic Weisbecker (1):
      posix-cpu-timers: Prevent spuriously armed 0-value itimer


 kernel/time/posix-cpu-timers.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/time/posix-cpu-timers.c b/kernel/time/posix-cpu-timers.c
index ee736861b18f..643d412ac623 100644
--- a/kernel/time/posix-cpu-timers.c
+++ b/kernel/time/posix-cpu-timers.c
@@ -1404,7 +1404,8 @@ void set_process_cpu_timer(struct task_struct *tsk, unsigned int clkid,
 			}
 		}
 
-		*newval += now;
+		if (*newval)
+			*newval += now;
 	}
 
 	/*