linux-kernel - [PATCH 2/3] uprobes: simplify error handling for alloc

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Message-ID: <20240710163111.GC13298@redhat.com>
Date: Wed, 10 Jul 2024 18:31:11 +0200
From: Oleg Nesterov <oleg@...hat.com>
To: andrii@...nel.org, mhiramat@...nel.org, peterz@...radead.org
Cc: clm@...a.com, jolsa@...nel.org, mingo@...nel.org, paulmck@...nel.org,
	rostedt@...dmis.org, linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org
Subject: [PATCH 2/3] uprobes: simplify error handling for alloc_uprobe()

From: Andrii Nakryiko <andrii@...nel.org>

Return -ENOMEM instead of NULL, which makes caller's error handling just
a touch simpler.

Signed-off-by: Andrii Nakryiko <andrii@...nel.org>
Signed-off-by: Oleg Nesterov <oleg@...hat.com>
---
 kernel/events/uprobes.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 4950decebe5c..e5b7c6239970 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -725,7 +725,7 @@ static struct uprobe *alloc_uprobe(struct inode *inode, loff_t offset,
 
 	uprobe = kzalloc(sizeof(struct uprobe), GFP_KERNEL);
 	if (!uprobe)
-		return NULL;
+		return ERR_PTR(-ENOMEM);
 
 	uprobe->inode = inode;
 	uprobe->offset = offset;
@@ -1166,8 +1166,6 @@ int uprobe_register(struct inode *inode, loff_t offset, loff_t ref_ctr_offset,
 
  retry:
 	uprobe = alloc_uprobe(inode, offset, ref_ctr_offset);
-	if (!uprobe)
-		return -ENOMEM;
 	if (IS_ERR(uprobe))
 		return PTR_ERR(uprobe);
 
-- 
2.25.1.362.g51ebf55