linux-kernel - [PATCH 4.19 023/100] cifs: fix memory leak in SMB2

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Message-Id: <20190430113609.986484214@linuxfoundation.org>
Date:   Tue, 30 Apr 2019 13:37:52 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ronnie Sahlberg <lsahlber@...hat.com>,
        Pavel Shilovsky <pshilov@...rosoft.com>,
        Steve French <stfrench@...rosoft.com>
Subject: [PATCH 4.19 023/100] cifs: fix memory leak in SMB2_read

From: Ronnie Sahlberg <lsahlber@...hat.com>

commit 05fd5c2c61732152a6bddc318aae62d7e436629b upstream.

Commit 088aaf17aa79300cab14dbee2569c58cfafd7d6e introduced a leak where
if SMB2_read() returned an error we would return without freeing the
request buffer.

Cc: Stable <stable@...r.kernel.org>
Signed-off-by: Ronnie Sahlberg <lsahlber@...hat.com>
Reviewed-by: Pavel Shilovsky <pshilov@...rosoft.com>
Signed-off-by: Steve French <stfrench@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/cifs/smb2pdu.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -3285,6 +3285,7 @@ SMB2_read(const unsigned int xid, struct
 					    rc);
 		}
 		free_rsp_buf(resp_buftype, rsp_iov.iov_base);
+		cifs_small_buf_release(req);
 		return rc == -ENODATA ? 0 : rc;
 	} else
 		trace_smb3_read_done(xid, req->PersistentFileId,