linux-kernel - [PATCH] smb: client: fix refcount leak in smb2_set_path

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Message-ID: <aQoYCxKqMHwH4sOK@osx.local>
Date: Tue, 4 Nov 2025 23:13:15 +0800
From: Shuhao Fu <sfual@....ust.hk>
To: Steve French <sfrench@...ba.org>
Cc: Paulo Alcantara <pc@...guebit.org>,
        Ronnie Sahlberg <ronniesahlberg@...il.com>,
        Shyam Prasad N <sprasad@...rosoft.com>, Tom Talpey <tom@...pey.com>,
        Bharath SM <bharathsm@...rosoft.com>, linux-cifs@...r.kernel.org,
        samba-technical@...ts.samba.org, linux-kernel@...r.kernel.org
Subject: [PATCH] smb: client: fix refcount leak in smb2_set_path_attr

Fix refcount leak in `smb2_set_path_attr` when path conversion fails.

Function `cifs_get_writable_path` returns `cfile` with its reference
counter `cfile->count` increased on success. Function `smb2_compound_op`
would decrease the reference counter for `cfile`, as stated in its 
comment. By calling `smb2_rename_path`, the reference counter of `cfile`
would leak if `cifs_convert_path_to_utf16` fails in `smb2_set_path_attr`.

Fixes: 8de9e86c67ba ("cifs: create a helper to find a writeable handle by path name")
Signed-off-by: Shuhao Fu <sfual@....ust.hk>
---
 fs/smb/client/smb2inode.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/smb/client/smb2inode.c b/fs/smb/client/smb2inode.c
index 09e3fc81d..69cb81fa0 100644
--- a/fs/smb/client/smb2inode.c
+++ b/fs/smb/client/smb2inode.c
@@ -1294,6 +1294,8 @@ static int smb2_set_path_attr(const unsigned int xid, struct cifs_tcon *tcon,
 	smb2_to_name = cifs_convert_path_to_utf16(to_name, cifs_sb);
 	if (smb2_to_name == NULL) {
 		rc = -ENOMEM;
+		if (cfile)
+			cifsFileInfo_put(cfile);
 		goto smb2_rename_path;
 	}
 	in_iov.iov_base = smb2_to_name;
-- 
2.39.5 (Apple Git-154)