linux-kernel - [PATCH v3] rcu/rcutorture: Improve error handling in rcu_torture_fwd_prog

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Message-Id: <20250910121427.3757718-1-kaushlendra.kumar@intel.com>
Date: Wed, 10 Sep 2025 17:44:27 +0530
From: Kaushlendra Kumar <kaushlendra.kumar@...el.com>
To: dave@...olabs.net,
	paulmck@...nel.org,
	josh@...htriplett.org,
	frederic@...nel.org,
	neeraj.upadhyay@...nel.org,
	rostedt@...dmis.org
Cc: linux-kernel@...r.kernel.org,
	rcu@...r.kernel.org,
	markus.elfring@....de,
	Kaushlendra Kumar <kaushlendra.kumar@...el.com>
Subject: [PATCH v3] rcu/rcutorture: Improve error handling in rcu_torture_fwd_prog_init()

Restructure error handling in rcu_torture_fwd_prog_init() to provide
cleaner allocation failure paths. The current code checks both
allocations in a single condition, making error handling less
efficient and clear.

The improved approach:
- Check rfp allocation immediately and return early on failure.
- Separately handle fwd_prog_tasks allocation failure with proper
  cleanup of allocated resources.
- Remove redundant kfree(fwd_prog_tasks) since it would be NULL on
  allocation failure.

Signed-off-by: Kaushlendra Kumar <kaushlendra.kumar@...el.com>
---
Changes in v3:
- Fixed word wrapping to eliminate orphaned words (runts).
- Removed duplicate marker line in changelog.
Changes in v2:
- Fixed word wrapping in commit message to follow kernel guidelines

 kernel/rcu/rcutorture.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 807fbf6123a7..6af0d207adba 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -2995,11 +2995,11 @@ static int __init rcu_torture_fwd_prog_init(void)
 	if (fwd_progress_div <= 0)
 		fwd_progress_div = 4;
 	rfp = kcalloc(fwd_progress, sizeof(*rfp), GFP_KERNEL);
+	if (!rfp)
+		return -ENOMEM;
 	fwd_prog_tasks = kcalloc(fwd_progress, sizeof(*fwd_prog_tasks), GFP_KERNEL);
-	if (!rfp || !fwd_prog_tasks) {
+	if (!fwd_prog_tasks) {
 		kfree(rfp);
-		kfree(fwd_prog_tasks);
-		fwd_prog_tasks = NULL;
 		fwd_progress = 0;
 		return -ENOMEM;
 	}
-- 
2.34.1