From: Paul E. McKenney <paulmck@kernel.org>
Date: Wed, 4 Mar 2026 23:40:39 +0000 (-0800)
Subject: torture: Avoid modulo-zero error in torture_hrtimeout_ns()
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=a18396219ba52b524d8b86bf9e2515b01c068614;p=thirdparty%2Flinux.git

torture: Avoid modulo-zero error in torture_hrtimeout_ns()

Currently, all calls to torture_hrtimeout_ns() either provide a non-zero
fuzzt_ns or a NULL trsp, either of which avoids taking the modulus of a
zero-valued fuzzt_ns.  But this code should do a better job of defending
itself, so this commit explicitly checks fuzzt_ns and avoids the modulus
when its value is zero.

Reviewed-by: Joel Fernandes <joelagnelf@nvidia.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
---

diff --git a/kernel/torture.c b/kernel/torture.c
index ec33709869766..62c1ac7776942 100644
--- a/kernel/torture.c
+++ b/kernel/torture.c
@@ -93,7 +93,7 @@ int torture_hrtimeout_ns(ktime_t baset_ns, u32 fuzzt_ns, const enum hrtimer_mode
 {
 	ktime_t hto = baset_ns;
 
-	if (trsp)
+	if (trsp && fuzzt_ns)
 		hto += torture_random(trsp) % fuzzt_ns;
 	set_current_state(TASK_IDLE);
 	return schedule_hrtimeout(&hto, mode);