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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, Ying Xu <yinxu@redhat.com>,
        Xin Long <lucien.xin@gmail.com>,
        Neil Horman <nhorman@tuxdriver.com>,
        "David S. Miller" <davem@davemloft.net>
Subject: [PATCH 4.19 19/68] sctp: call iov_iter_revert() after sending ABORT
Date:   Fri,  8 Mar 2019 13:49:49 +0100
Message-Id: <20190308124911.779678627@linuxfoundation.org>
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4.19-stable review patch.  If anyone has any objections, please let me know.

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

From: Xin Long <lucien.xin@gmail.com>

[ Upstream commit 901efe12318b1ea8d3e2c88a7b75ed6e6d5d7245 ]

The user msg is also copied to the abort packet when doing SCTP_ABORT in
sctp_sendmsg_check_sflags(). When SCTP_SENDALL is set, iov_iter_revert()
should have been called for sending abort on the next asoc with copying
this msg. Otherwise, memcpy_from_msg() in sctp_make_abort_user() will
fail and return error.

Fixes: 4910280503f3 ("sctp: add support for snd flag SCTP_SENDALL process in sendmsg")
Reported-by: Ying Xu <yinxu@redhat.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/sctp/socket.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -1884,6 +1884,7 @@ static int sctp_sendmsg_check_sflags(str
 
 		pr_debug("%s: aborting association:%p\n", __func__, asoc);
 		sctp_primitive_ABORT(net, asoc, chunk);
+		iov_iter_revert(&msg->msg_iter, msg_len);
 
 		return 0;
 	}