IB/srp: Fix remove_one crash due to resource exhaustion
authorDotan Barak <dotanb@dev.mellanox.co.il>
Wed, 12 Jun 2013 13:20:36 +0000 (15:20 +0200)
committerRoland Dreier <roland@purestorage.com>
Thu, 27 Jun 2013 23:44:38 +0000 (16:44 -0700)
commit1fe0cb848890a3f4dd965fdce8b4108feb03971f
tree9a67c6334982b2e2a05f2e63e3b2b1ca3740dd13
parentfedaf4ffc224a194e2d13a3ec2abe5df0bc94258
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>
drivers/infiniband/ulp/srp/ib_srp.c