RDMA/mlx5: Fix multiple NULL-ptr deref errors in rereg_mr flow

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commit b4bd701ac4 upstream.

Failure in rereg MR releases UMEM but leaves the MR to be destroyed
by the user. As a result the following scenario may happen:
"create MR -> rereg MR with failure -> call to rereg MR again" and
hit "NULL-ptr deref or user memory access" errors.

Ensure that rereg MR is only performed on a non-dead MR.

Cc: syzkaller <syzkaller@googlegroups.com>
Cc: <stable@vger.kernel.org> # 4.5
Fixes: 395a8e4c32 ("IB/mlx5: Refactoring register MR code")
Reported-by: Noa Osherovich <noaos@mellanox.com>
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>

...

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Leon Romanovsky 2018-04-23 17:01:52 +03:00 • committed by Greg Kroah-Hartman

parent 3ae1bf3681

commit be855252eb

1 changed files with 23 additions and 9 deletions

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drivers/infiniband/hw/mlx5/mr.c

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