diff options
| author | Jia-Ju Bai <baijiaju1990@163.com> | 2017-06-05 20:23:40 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-11-10 07:42:46 -0800 |
| commit | e7d5fa96ef7bee036b751af01f62ade7d482b13d (patch) | |
| tree | 03093f1f337193ae966f1b8e83cb204d364bfb9d /drivers/infiniband/sw | |
| parent | 0da0e51729959e047e2e6f4a8e3554826b8cc607 (diff) | |
| download | linux-rt-e7d5fa96ef7bee036b751af01f62ade7d482b13d.tar.gz | |
rxe: Fix a sleep-in-atomic bug in post_one_send
[ Upstream commit 07d432bb97f19dd5e784175152f9fce3b2646133 ]
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 <baijiaju1990@163.com>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Acked-by: Moni Shoua <monis@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/infiniband/sw')
| -rw-r--r-- | drivers/infiniband/sw/rxe/rxe_verbs.c | 9 |
1 files changed, 2 insertions, 7 deletions
diff --git a/drivers/infiniband/sw/rxe/rxe_verbs.c b/drivers/infiniband/sw/rxe/rxe_verbs.c index ced416f5dffb..ef13082d6ca1 100644 --- a/drivers/infiniband/sw/rxe/rxe_verbs.c +++ b/drivers/infiniband/sw/rxe/rxe_verbs.c @@ -729,13 +729,8 @@ 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; } |