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From: Ronnie Sahlberg <lsahlber@redhat.com>
To: linux-cifs <linux-cifs@vger.kernel.org>
Cc: Steve French <smfrench@gmail.com>,
	Stable <stable@vger.kernel.org>,
	Ronnie Sahlberg <lsahlber@redhat.com>
Subject: [PATCH] cifs: fix handle leak in smb2_query_symlink()
Date: Wed, 10 Apr 2019 07:47:22 +1000	[thread overview]
Message-ID: <20190409214722.27472-1-lsahlber@redhat.com> (raw)

If we enter smb2_query_symlink() for something that is not a symlink
and where the SMB2_open() would succeed we would never end up
closing this handle and would thus leak a handle on the server.

Fix this by immediately calling SMB2_close() on successfull open.

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
CC: Stable <stable@vger.kernel.org>
---
 fs/cifs/smb2ops.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 83a100dd2497..ab4737e3c31f 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -2397,6 +2397,8 @@ smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
 
 	rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, &err_iov,
 		       &resp_buftype);
+	if (!rc)
+		SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 	if (!rc || !err_iov.iov_base) {
 		rc = -ENOENT;
 		goto free_path;
-- 
2.13.6


             reply	other threads:[~2019-04-09 21:47 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-09 21:47 Ronnie Sahlberg [this message]
2019-04-09 22:06 ` [PATCH] cifs: fix handle leak in smb2_query_symlink() Pavel Shilovsky

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