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authorJia-Ju Bai <baijiaju1990@163.com>2017-06-05 14:23:40 +0200
committerDoug Ledford <dledford@redhat.com>2017-06-14 19:02:01 +0200
commit07d432bb97f19dd5e784175152f9fce3b2646133 (patch)
treef7467081cde8500b5746a39cd8692f95532b22f0 /drivers/infiniband/sw
parentRDMA/qedr: Add 64KB PAGE_SIZE support to user-space queues (diff)
downloadlinux-07d432bb97f19dd5e784175152f9fce3b2646133.tar.xz
linux-07d432bb97f19dd5e784175152f9fce3b2646133.zip
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 <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>
Diffstat (limited to 'drivers/infiniband/sw')
-rw-r--r--drivers/infiniband/sw/rxe/rxe_verbs.c9
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 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;
}