[PATCH 4.9 02/86] RDMA/ucma: Check that user doesnt overflow QP state

Greg Kroah-Hartman
2018-03-16T15:22:25Z

From: Leon Romanovsky <leonro@mellanox.com>

commit a5880b84430316e3e1c1f5d23aa32ec6000cc717 upstream.

The QP state is limited and declared in enum ib_qp_state,
but ucma user was able to supply any possible (u32) value.

Reported-by: syzbot+0df1ab766f8924b1edba@syzkaller.appspotmail.com
Fixes: 75216638572f ("RDMA/cma: Export rdma cm interface to userspace")
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/infiniband/core/ucma.c | 3 +++
1 file changed, 3 insertions(+)

--- a/drivers/infiniband/core/ucma.c
+++ b/drivers/infiniband/core/ucma.c
@@ -1139,6 +1139,9 @@ static ssize_t ucma_init_qp_attr(struct
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;

+ if (cmd.qp_state > IB_QPS_ERR)
+ return -EINVAL;
+
ctx = ucma_get_ctx(file, cmd.id);
if (IS_ERR(ctx))
return PTR_ERR(ctx);