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| author | Dotan Barak <dotanb@dev.mellanox.co.il> | 2013-06-12 15:20:36 +0200 |
|---|---|---|
| committer | Roland Dreier <roland@purestorage.com> | 2013-06-27 16:44:38 -0700 |
| commit | 1fe0cb848890a3f4dd965fdce8b4108feb03971f (patch) | |
| tree | 9a67c6334982b2e2a05f2e63e3b2b1ca3740dd13 | |
| parent | fedaf4ffc224a194e2d13a3ec2abe5df0bc94258 (diff) | |
| download | blackbird-op-linux-1fe0cb848890a3f4dd965fdce8b4108feb03971f.tar.gz blackbird-op-linux-1fe0cb848890a3f4dd965fdce8b4108feb03971f.zip | |
IB/srp: Fix remove_one crash due to resource exhaustion
If the add_one callback fails during driver load no resources are
allocated so there isn't a need to release any resources. Trying
to clean the resource may lead to the following kernel panic:
BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<ffffffffa0132331>] srp_remove_one+0x31/0x240 [ib_srp]
RIP: 0010:[<ffffffffa0132331>] [<ffffffffa0132331>] srp_remove_one+0x31/0x240 [ib_srp]
Process rmmod (pid: 4562, threadinfo ffff8800dd738000, task ffff8801167e60c0)
Call Trace:
[<ffffffffa024500e>] ib_unregister_client+0x4e/0x120 [ib_core]
[<ffffffffa01361bd>] srp_cleanup_module+0x15/0x71 [ib_srp]
[<ffffffff810ac6a4>] sys_delete_module+0x194/0x260
[<ffffffff8100b0f2>] system_call_fastpath+0x16/0x1b
Signed-off-by: Dotan Barak <dotanb@dev.mellanox.co.il>
Reviewed-by: Eli Cohen <eli@mellanox.co.il>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Acked-by: Sebastian Riemer <sebastian.riemer@profitbricks.com>
Acked-by: David Dillow <dillowda@ornl.gov>
Signed-off-by: Roland Dreier <roland@purestorage.com>
| -rw-r--r-- | drivers/infiniband/ulp/srp/ib_srp.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c index 7ccf3284dda3..368d1606e16f 100644 --- a/drivers/infiniband/ulp/srp/ib_srp.c +++ b/drivers/infiniband/ulp/srp/ib_srp.c @@ -2507,6 +2507,8 @@ static void srp_remove_one(struct ib_device *device) struct srp_target_port *target; srp_dev = ib_get_client_data(device, &srp_client); + if (!srp_dev) + return; list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) { device_unregister(&host->dev); |
