linux-kernel - [v6.6][PATCH 10/57] eventfs: Fix failure path in eventfs_create_events

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Message-ID: <20240206120948.003109160@rostedt.homelinux.com>
Date: Tue, 06 Feb 2024 07:09:15 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: linux-kernel@...r.kernel.org,
 stable@...r.kernel.org
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Sasha Levin <sashal@...nel.org>,
 Masami Hiramatsu <mhiramat@...nel.org>,
 Mark Rutland <mark.rutland@....com>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Julia Lawall <julia.lawall@...ia.fr>
Subject: [v6.6][PATCH 10/57] eventfs: Fix failure path in eventfs_create_events_dir()

From: "Steven Rostedt (Google)" <rostedt@...dmis.org>

The failure path of allocating ei goes to a path that dereferences ei.
Add another label that skips over the ei dereferences to do the rest of
the clean up.

Link: https://lore.kernel.org/all/70e7bace-561c-95f-1117-706c2c220bc@inria.fr/
Link: https://lore.kernel.org/linux-trace-kernel/20231019204132.6662fef0@gandalf.local.home

Cc: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>
Fixes: 5790b1fb3d67 ("eventfs: Remove eventfs_file and just use eventfs_inode")
Reported-by: Julia Lawall <julia.lawall@...ia.fr>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
(cherry picked from commit 7e8ad67c9b5c11e990c320ed7e7563f2301672a7)
---
 fs/tracefs/event_inode.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/tracefs/event_inode.c b/fs/tracefs/event_inode.c
index 9f19b6608954..1885f1f1f339 100644
--- a/fs/tracefs/event_inode.c
+++ b/fs/tracefs/event_inode.c
@@ -735,7 +735,7 @@ struct eventfs_inode *eventfs_create_events_dir(const char *name, struct dentry
 
 	ei = kzalloc(sizeof(*ei), GFP_KERNEL);
 	if (!ei)
-		goto fail;
+		goto fail_ei;
 
 	inode = tracefs_get_inode(dentry->d_sb);
 	if (unlikely(!inode))
@@ -781,6 +781,7 @@ struct eventfs_inode *eventfs_create_events_dir(const char *name, struct dentry
  fail:
 	kfree(ei->d_children);
 	kfree(ei);
+ fail_ei:
 	tracefs_failed_creating(dentry);
 	return ERR_PTR(-ENOMEM);
 }
-- 
2.43.0