4.4-stable review patch. If anyone has any objections, please let me know.
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From: Maor Gottlieb maorg@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 maorg@mellanox.com Signed-off-by: Leon Romanovsky leon@kernel.org Signed-off-by: Doug Ledford dledford@redhat.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/infiniband/hw/mlx4/main.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/drivers/infiniband/hw/mlx4/main.c +++ b/drivers/infiniband/hw/mlx4/main.c @@ -1055,6 +1055,8 @@ static void mlx4_ib_disassociate_ucontex 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; }