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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Lars Persson <lists@bofh.nu>,
        Ronnie Sahlberg <lsahlber@redhat.com>,
        Pavel Shilovsky <pshilov@microsoft.com>,
        Steve French <stfrench@microsoft.com>,
        Sasha Levin <alexander.levin@microsoft.com>
Subject: [PATCH 4.14 22/77] Revert "cifs: fix memory leak in SMB2_read"
Date:   Thu, 23 May 2019 21:05:40 +0200
Message-Id: <20190523181723.408443846@linuxfoundation.org>
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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

This reverts commit c54a881d793e3eea2a1b1460c5778b22128821ea which is
commit 05fd5c2c61732152a6bddc318aae62d7e436629b upstream.

Lars writes:
	This patch should not be in 4.14-stable because
	088aaf17aa79300cab14dbee2569c58cfafd7d6e was for 4.18+.

	Now we have a double-free crash in SMB2_read because there are 2
	calls to cifs_small_buf_release in the error path.

It was a mistake to backport it this far, so let's revert it.

Reported-by: Lars Persson <lists@bofh.nu>
Cc: Ronnie Sahlberg <lsahlber@redhat.com>
Cc: Pavel Shilovsky <pshilov@microsoft.com>
Cc: Steve French <stfrench@microsoft.com>
Cc: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/cifs/smb2pdu.c |    1 -
 1 file changed, 1 deletion(-)

--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -2699,7 +2699,6 @@ SMB2_read(const unsigned int xid, struct
 			cifs_dbg(VFS, "Send error in read = %d\n", rc);
 		}
 		free_rsp_buf(resp_buftype, rsp_iov.iov_base);
-		cifs_small_buf_release(req);
 		return rc == -ENODATA ? 0 : rc;
 	}