linux-kernel - [PATCH v2 3/5] uprobes: simplify error handling for alloc

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Message-ID: <20240729134525.GA12315@redhat.com>
Date: Mon, 29 Jul 2024 15:45:25 +0200
From: Oleg Nesterov <oleg@...hat.com>
To: andrii@...nel.org, mhiramat@...nel.org, peterz@...radead.org
Cc: jolsa@...nel.org, rostedt@...dmis.org, linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org
Subject: [PATCH v2 3/5] 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 eb71428691bb..dfe6306a63b1 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;
@@ -1167,8 +1167,6 @@ static int __uprobe_register(struct inode *inode, loff_t 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