Hi Qing, > -----Original Message----- > From: linux-rdma-owner@xxxxxxxxxxxxxxx [mailto:linux-rdma- > owner@xxxxxxxxxxxxxxx] On Behalf Of Qing Huang > Sent: Thursday, November 02, 2017 6:22 PM > To: linux-rdma@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx > Cc: dledford@xxxxxxxxxx; sean.hefty@xxxxxxxxx; hal.rosenstock@xxxxxxxxx; > ira.weiny@xxxxxxxxx; Mark Bloch <markb@xxxxxxxxxxxx>; Qing Huang > <qing.huang@xxxxxxxxxx> > Subject: [PATCH] IB/CM: fix memory corruption by avoiding unnecessary > memset > > The size of path array could be dynamic. However the fixed number(2) of > memset could cause memory corruption by writing into wrong memory space. > > Fixes: 9fdca4da4d8c (IB/SA: Split struct sa_path_rec based on IB ands > ROCE specific fields) > > Signed-off-by: Qing Huang <qing.huang@xxxxxxxxxx> > --- > drivers/infiniband/core/cm.c | 8 +++++--- > 1 file changed, 5 insertions(+), 3 deletions(-) > > diff --git a/drivers/infiniband/core/cm.c b/drivers/infiniband/core/cm.c index > 4c4b465..af4f6a0 100644 > --- a/drivers/infiniband/core/cm.c > +++ b/drivers/infiniband/core/cm.c > @@ -1856,7 +1856,9 @@ static int cm_req_handler(struct cm_work *work) > cm_process_routed_req(req_msg, work->mad_recv_wc->wc); > > memset(&work->path[0], 0, sizeof(work->path[0])); > - memset(&work->path[1], 0, sizeof(work->path[1])); > + if (cm_req_has_alt_path(req_msg)) > + memset(&work->path[1], 0, sizeof(work->path[1])); > + > grh = rdma_ah_read_grh(&cm_id_priv->av.ah_attr); > ret = ib_get_cached_gid(work->port->cm_dev->ib_device, > work->port->port_num, > @@ -3823,8 +3825,8 @@ static void cm_recv_handler(struct ib_mad_agent > *mad_agent, > > switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { > case CM_REQ_ATTR_ID: > - paths = 1 + (((struct cm_req_msg *) mad_recv_wc- > >recv_buf.mad)-> > - alt_local_lid != 0); > + paths = 1 + cm_req_has_alt_path( > + (struct cm_req_msg *)mad_recv_wc- > >recv_buf.mad); > event = IB_CM_REQ_RECEIVED; > break; > case CM_MRA_ATTR_ID: > -- > 2.9.3 > Thanks for the patch. Few weeks back I came across this bug and fix [1] is merged now by Doug. [1] has one additional fix in cm_format_req_event() function as well. [1] https://patchwork.kernel.org/patch/10015997/ -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
