srp_destroy_qp is designed to indicate we are safe to continue with
freeing the channel resources by modifying the qp error state,
posting a dummy wr on the queue-pair and waiting for it to flush.
This also holds for the channel registration pool as we are unmapping
the memory region when handling a scsi response. Destroying the
channel registration pool before we make sure we processed all the
inflight IO might introduce a use-after-free of the registration pool.
This use-after-free is demonstrated in the stack trace below where
srp is trying to unmap a used FMR after the fmr_pool was already destroyed.
general protection fault: 0000 [#1] SMP
RIP: 0010:[<
ffffffff8151121b>] [<
ffffffff8151121b>] _raw_spin_lock_irqsave+0x1b/0x50
Call Trace:
[<
ffffffffa055d88a>] ib_fmr_pool_unmap+0x1a/0xb0 [ib_core]
[<
ffffffffa06c00ed>] srp_unmap_data.isra.28+0x17d/0x250 [ib_srp]
[<
ffffffffa06c01eb>] srp_free_req+0x2b/0x60 [ib_srp]
[<
ffffffffa06c0c94>] srp_recv_completion+0x174/0x580 [ib_srp]
[<
ffffffffa04580fe>] mlx4_eq_int+0x4de/0xe50 [mlx4_core]
[<
ffffffffa0458b00>] mlx4_msi_x_interrupt+0x10/0x20 [mlx4_core]
[<
ffffffff810abc45>] handle_irq_event_percpu+0x35/0x1b0
[<
ffffffff810abdf2>] handle_irq_event+0x32/0x50
[<
ffffffff810ae5cf>] handle_edge_irq+0x6f/0x120
[<
ffffffff8100455a>] handle_irq+0x1a/0x30
[<
ffffffff8151b475>] do_IRQ+0x45/0xb0
[<
ffffffff8151162d>] common_interrupt+0x6d/0x6d
[<
ffffffff813e4d2f>] cpuidle_enter_state+0x4f/0xc0
[<
ffffffff813e4e6c>] cpuidle_idle_call+0xcc/0x210
[<
ffffffff8100b9ea>] arch_cpu_idle+0xa/0x30
[<
ffffffff810ab1e1>] cpu_startup_entry+0xe1/0x270
[<
ffffffff81030b3a>] start_secondary+0x21a/0x2c0
Reported-by: Eliott Kespi <eliottk@mellanox.com>
Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
"FR pool allocation failed (%d)\n", ret);
goto err_qp;
}
- if (ch->fr_pool)
- srp_destroy_fr_pool(ch->fr_pool);
- ch->fr_pool = fr_pool;
} else if (dev->use_fmr) {
fmr_pool = srp_alloc_fmr_pool(target);
if (IS_ERR(fmr_pool)) {
"FMR pool allocation failed (%d)\n", ret);
goto err_qp;
}
- if (ch->fmr_pool)
- ib_destroy_fmr_pool(ch->fmr_pool);
- ch->fmr_pool = fmr_pool;
}
if (ch->qp)
ch->recv_cq = recv_cq;
ch->send_cq = send_cq;
+ if (dev->use_fast_reg) {
+ if (ch->fr_pool)
+ srp_destroy_fr_pool(ch->fr_pool);
+ ch->fr_pool = fr_pool;
+ } else if (dev->use_fmr) {
+ if (ch->fmr_pool)
+ ib_destroy_fmr_pool(ch->fmr_pool);
+ ch->fmr_pool = fmr_pool;
+ }
+
kfree(init_attr);
return 0;