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| author | Sagi Grimberg <sagig@mellanox.com> | 2015-08-24 19:04:51 +0300 |
|---|---|---|
| committer | Doug Ledford <dledford@redhat.com> | 2015-09-03 15:59:48 -0400 |
| commit | 7fbc67df2cd6d0b72fd5d6d3acaa79ab6f5b0224 (patch) | |
| tree | 83730c17d8dd8aedc08e8740966fdebd5b962881 /drivers/infiniband/ulp/srp | |
| parent | 0629cb06cdf8f1a403ce71bce5b83380ae898e1a (diff) | |
| download | linux-7fbc67df2cd6d0b72fd5d6d3acaa79ab6f5b0224.tar.bz2 | |
IB/srp: Fix possible protection fault
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>
Diffstat (limited to 'drivers/infiniband/ulp/srp')
| -rw-r--r-- | drivers/infiniband/ulp/srp/ib_srp.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c index ca98d3b47281..b481490ad257 100644 --- a/drivers/infiniband/ulp/srp/ib_srp.c +++ b/drivers/infiniband/ulp/srp/ib_srp.c @@ -554,9 +554,6 @@ static int srp_create_ch_ib(struct srp_rdma_ch *ch) "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)) { @@ -565,9 +562,6 @@ static int srp_create_ch_ib(struct srp_rdma_ch *ch) "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) @@ -581,6 +575,16 @@ static int srp_create_ch_ib(struct srp_rdma_ch *ch) 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; |