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| author |   Parav Pandit <parav@mellanox.com> | 2020-01-26 16:26:46 +0200 |
|---|---|---|
| committer |   Jason Gunthorpe <jgg@mellanox.com> | 2020-01-28 14:15:23 -0400 |
| commit | b4fb4cc5ba83b20dae13cef116c33648e81d2f44 (patch) | |
| tree | 54131bb2aae71cd577f70fc94a7c2605be73f509 /drivers/infiniband/core/cma.c | |
| parent | RDMA/umem: Fix ib_umem_find_best_pgsz() (diff) | |
| download | linux-dev-b4fb4cc5ba83b20dae13cef116c33648e81d2f44.tar.xz linux-dev-b4fb4cc5ba83b20dae13cef116c33648e81d2f44.zip | |
RDMA/cma: Fix unbalanced cm_id reference count during address resolve
Below commit missed the AF_IB and loopback code flow in
rdma_resolve_addr(). This leads to an unbalanced cm_id refcount in
cma_work_handler() which puts the refcount which was not incremented prior
to queuing the work.
A call trace is observed with such code flow:
BUG: unable to handle kernel NULL pointer dereference at (null)
[<ffffffff96b67e16>] __mutex_lock_slowpath+0x166/0x1d0
[<ffffffff96b6715f>] mutex_lock+0x1f/0x2f
[<ffffffffc0beabb5>] cma_work_handler+0x25/0xa0
[<ffffffff964b9ebf>] process_one_work+0x17f/0x440
[<ffffffff964baf56>] worker_thread+0x126/0x3c0
Hence, hold the cm_id reference when scheduling the resolve work item.
Fixes: 722c7b2bfead ("RDMA/{cma, core}: Avoid callback on rdma_addr_cancel()")
Link: https://lore.kernel.org/r/20200126142652.104803-2-leon@kernel.org
Signed-off-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to '')
| -rw-r--r-- | drivers/infiniband/core/cma.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c index 55a9afacfedd..72f032160c4b 100644 --- a/drivers/infiniband/core/cma.c +++ b/drivers/infiniband/core/cma.c @@ -3148,6 +3148,7 @@ static int cma_resolve_loopback(struct rdma_id_private *id_priv) rdma_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid); rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid); + atomic_inc(&id_priv->refcount); cma_init_resolve_addr_work(work, id_priv); queue_work(cma_wq, &work->work); return 0; @@ -3174,6 +3175,7 @@ static int cma_resolve_ib_addr(struct rdma_id_private *id_priv) rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, (union ib_gid *) &(((struct sockaddr_ib *) &id_priv->id.route.addr.dst_addr)->sib_addr)); + atomic_inc(&id_priv->refcount); cma_init_resolve_addr_work(work, id_priv); queue_work(cma_wq, &work->work); return 0; |