From 07d432bb97f19dd5e784175152f9fce3b2646133 Mon Sep 17 00:00:00 2001 From: Jia-Ju Bai Date: Mon, 5 Jun 2017 20:23:40 +0800 Subject: rxe: Fix a sleep-in-atomic bug in post_one_send The driver may sleep under a spin lock, and the function call path is: post_one_send (acquire the lock by spin_lock_irqsave) init_send_wqe copy_from_user --> may sleep There is no flow that makes "qp->is_user" true, and copy_from_user may cause bug when a non-user pointer is used. So the lines of copy_from_user and check of "qp->is_user" are removed. Signed-off-by: Jia-Ju Bai Reviewed-by: Leon Romanovsky Acked-by: Moni Shoua Signed-off-by: Doug Ledford --- drivers/infiniband/sw/rxe/rxe_verbs.c | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-) (limited to 'drivers') diff --git a/drivers/infiniband/sw/rxe/rxe_verbs.c b/drivers/infiniband/sw/rxe/rxe_verbs.c index 83d709e74dfb..073e66783f1d 100644 --- a/drivers/infiniband/sw/rxe/rxe_verbs.c +++ b/drivers/infiniband/sw/rxe/rxe_verbs.c @@ -740,13 +740,8 @@ static int init_send_wqe(struct rxe_qp *qp, struct ib_send_wr *ibwr, sge = ibwr->sg_list; for (i = 0; i < num_sge; i++, sge++) { - if (qp->is_user && copy_from_user(p, (__user void *) - (uintptr_t)sge->addr, sge->length)) - return -EFAULT; - - else if (!qp->is_user) - memcpy(p, (void *)(uintptr_t)sge->addr, - sge->length); + memcpy(p, (void *)(uintptr_t)sge->addr, + sge->length); p += sge->length; } -- cgit v1.2.3-58-ga151