linux-kernel - [PATCH] eventfs: Fix failure path in eventfs_create_events

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Date:   Thu, 19 Oct 2023 20:41:32 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     LKML <linux-kernel@...r.kernel.org>,
        Linux Trace Kernel <linux-trace-kernel@...r.kernel.org>
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Julia Lawall <julia.lawall@...ia.fr>
Subject: [PATCH] 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/

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>
---
 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);
 }
-- 
2.42.0