From: Maor Gottlieb <ma...@mellanox.com>

[ Upstream commit ca37a664a8e4e9988b220988ceb4d79e3316f195 ]

Anonymous VMA (->vm_ops == NULL) cannot be shared, otherwise
it would lead to SIGBUS.

Remove the shared flags from the vma after we change it to be
anonymous.

This is easily reproduced by doing modprobe -r while running a
user-space application such as raw_ethernet_bw.

Fixes: ae184ddeca5db ('IB/mlx4_ib: Disassociate support')
Signed-off-by: Maor Gottlieb <ma...@mellanox.com>
Signed-off-by: Leon Romanovsky <l...@kernel.org>
Signed-off-by: Doug Ledford <dledf...@redhat.com>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
---
 drivers/infiniband/hw/mlx4/main.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/infiniband/hw/mlx4/main.c 
b/drivers/infiniband/hw/mlx4/main.c
index 9119e0b3c2b8..67c4c73343d4 100644
--- a/drivers/infiniband/hw/mlx4/main.c
+++ b/drivers/infiniband/hw/mlx4/main.c
@@ -1055,6 +1055,8 @@ static void mlx4_ib_disassociate_ucontext(struct 
ib_ucontext *ibcontext)
                        BUG_ON(1);
                }
 
+               context->hw_bar_info[i].vma->vm_flags &=
+                       ~(VM_SHARED | VM_MAYSHARE);
                /* context going to be destroyed, should not access ops any 
more */
                context->hw_bar_info[i].vma->vm_ops = NULL;
        }
-- 
2.14.1

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