linux-hardening - [PATCH v2 3/4] pstore: inode: Use __free(pstore

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Message-Id: <20231205182622.1329923-3-keescook@chromium.org>
Date: Tue,  5 Dec 2023 10:26:16 -0800
From: Kees Cook <keescook@...omium.org>
To: "Guilherme G. Piccoli" <gpiccoli@...lia.com>
Cc: Kees Cook <keescook@...omium.org>,
	Tony Luck <tony.luck@...el.com>,
	linux-hardening@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/4] pstore: inode: Use __free(pstore_iput) for inode allocations

Simplify error path for failures where "inode" needs to be freed.

Cc: "Guilherme G. Piccoli" <gpiccoli@...lia.com>
Cc: Tony Luck <tony.luck@...el.com>
Cc: linux-hardening@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 fs/pstore/inode.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/fs/pstore/inode.c b/fs/pstore/inode.c
index 0d89e0014b6f..a27764341079 100644
--- a/fs/pstore/inode.c
+++ b/fs/pstore/inode.c
@@ -35,6 +35,8 @@ static LIST_HEAD(records_list);
 static DEFINE_MUTEX(pstore_sb_lock);
 static struct super_block *pstore_sb;
 
+DEFINE_FREE(pstore_iput, struct inode *, if (_T) iput(_T))
+
 struct pstore_private {
 	struct list_head list;
 	struct dentry *dentry;
@@ -337,7 +339,7 @@ int pstore_put_backend_records(struct pstore_info *psi)
 int pstore_mkfile(struct dentry *root, struct pstore_record *record)
 {
 	struct dentry		*dentry;
-	struct inode		*inode;
+	struct inode		*inode __free(pstore_iput) = NULL;
 	int			rc = 0;
 	char			name[PSTORE_NAMELEN];
 	struct pstore_private	*private, *pos;
@@ -369,7 +371,7 @@ int pstore_mkfile(struct dentry *root, struct pstore_record *record)
 
 	private = kzalloc(sizeof(*private), GFP_KERNEL);
 	if (!private)
-		goto fail_inode;
+		return -ENOMEM;
 
 	dentry = d_alloc_name(root, name);
 	if (!dentry)
@@ -384,7 +386,7 @@ int pstore_mkfile(struct dentry *root, struct pstore_record *record)
 		inode_set_mtime_to_ts(inode,
 				      inode_set_ctime_to_ts(inode, record->time));
 
-	d_add(dentry, inode);
+	d_add(dentry, no_free_ptr(inode));
 
 	list_add(&private->list, &records_list);
 
@@ -392,8 +394,6 @@ int pstore_mkfile(struct dentry *root, struct pstore_record *record)
 
 fail_private:
 	free_pstore_private(private);
-fail_inode:
-	iput(inode);
 	return rc;
 }
 
-- 
2.34.1