linux-kernel - [PATCH 4.9 60/80] cifs: fix leak in FSCTL_ENUM

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Message-Id: <20170518104836.664359368@linuxfoundation.org>
Date:   Thu, 18 May 2017 12:48:42 +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, David Disseldorp <ddiss@...e.de>,
        Steve French <smfrench@...il.com>
Subject: [PATCH 4.9 60/80] cifs: fix leak in FSCTL_ENUM_SNAPS response handling

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: David Disseldorp <ddiss@...e.de>

commit 0e5c795592930d51fd30d53a2e7b73cba022a29b upstream.

The server may respond with success, and an output buffer less than
sizeof(struct smb_snapshot_array) in length. Do not leak the output
buffer in this case.

Fixes: 834170c85978 ("Enable previous version support")
Signed-off-by: David Disseldorp <ddiss@...e.de>
Signed-off-by: Steve French <smfrench@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/cifs/smb2ops.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -924,6 +924,7 @@ smb3_enum_snapshots(const unsigned int x
 		}
 		if (snapshot_in.snapshot_array_size < sizeof(struct smb_snapshot_array)) {
 			rc = -ERANGE;
+			kfree(retbuf);
 			return rc;
 		}