4.20-stable review patch. If anyone has any objections, please let me know. ------------------ From: Xin Long <lucien.xin@xxxxxxxxx> [ 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@xxxxxxxxxx> Signed-off-by: Xin Long <lucien.xin@xxxxxxxxx> Acked-by: Neil Horman <nhorman@xxxxxxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- net/sctp/socket.c | 1 + 1 file changed, 1 insertion(+) --- a/net/sctp/socket.c +++ b/net/sctp/socket.c @@ -1866,6 +1866,7 @@ 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; }