tree 78f5e39aff67d8d18ab430d69b20e281af673439
parent 943bd984b108b3bb778790c2da4ae8d186b547e6
author Leon Romanovsky <leonro@mellanox.com> 1555416790 +0300
committer Jason Gunthorpe <jgg@mellanox.com> 1557155214 -0300

RDMA/rdmavt: Catch use-after-free access of AH structures

Prior to commit d345691471b4 ("RDMA: Handle AH allocations by IB/core"),
AH destroy path is rdmavt returned -EBUSY warning to application and
caused to potential leakage of kernel memory of AH structure.

After that commit, the AH structure is always freed but such early return
in driver code can potentially cause to use-after-free error.

Add warning to catch such situation to help driver developers to fix AH
release path.

Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>