On Wed, Sep 11, 2019 at 07:30:53AM -0400, Dennis Dalessandro wrote:
> From: Ira Weiny <ira.weiny@xxxxxxxxx>
>
> Define the working variables to be unsigned long to be compatible with
> for_each_set_bit and change types as needed.
>
> While we are at it remove unused variables from a couple of functions.
>
> This was found because of the following KASAN warning:
> [ 1383.018461] ==================================================================
> [ 1383.029116] BUG: KASAN: stack-out-of-bounds in find_first_bit+0x19/0x70
> [ 1383.038646] Read of size 8 at addr ffff888362d778d0 by task kworker/u308:2/1889
> [ 1383.049006]
> [ 1383.052766] CPU: 21 PID: 1889 Comm: kworker/u308:2 Tainted: G W 5.3.0-rc2-mm1+ #2
> [ 1383.064765] Hardware name: Intel Corporation W2600CR/W2600CR, BIOS SE5C600.86B.02.04.0003.102320141138 10/23/2014
> [ 1383.078498] Workqueue: ib-comp-unb-wq ib_cq_poll_work [ib_core]
> [ 1383.087314] Call Trace:
> [ 1383.092211] dump_stack+0x9a/0xf0
> [ 1383.098074] ? find_first_bit+0x19/0x70
> [ 1383.104546] print_address_description+0x6c/0x332
> [ 1383.111986] ? find_first_bit+0x19/0x70
> [ 1383.118443] ? find_first_bit+0x19/0x70
> [ 1383.124882] __kasan_report.cold.6+0x1a/0x3b
> [ 1383.131808] ? find_first_bit+0x19/0x70
> [ 1383.138244] kasan_report+0xe/0x12
> [ 1383.144169] find_first_bit+0x19/0x70
> [ 1383.150413] pma_get_opa_portstatus+0x5cc/0xa80 [hfi1]
> [ 1383.158275] ? ret_from_fork+0x3a/0x50
> [ 1383.164583] ? pma_get_opa_port_ectrs+0x200/0x200 [hfi1]
> [ 1383.172629] ? stack_trace_consume_entry+0x80/0x80
> [ 1383.180097] hfi1_process_mad+0x39b/0x26c0 [hfi1]
> [ 1383.187420] ? __lock_acquire+0x65e/0x21b0
> [ 1383.194081] ? clear_linkup_counters+0xb0/0xb0 [hfi1]
> [ 1383.201788] ? check_chain_key+0x1d7/0x2e0
> [ 1383.208391] ? lock_downgrade+0x3a0/0x3a0
> [ 1383.214906] ? match_held_lock+0x2e/0x250
> [ 1383.221479] ib_mad_recv_done+0x698/0x15e0 [ib_core]
> [ 1383.229187] ? clear_linkup_counters+0xb0/0xb0 [hfi1]
> [ 1383.236977] ? ib_mad_send_done+0xc80/0xc80 [ib_core]
> [ 1383.244778] ? mark_held_locks+0x79/0xa0
> [ 1383.251341] ? _raw_spin_unlock_irqrestore+0x44/0x60
> [ 1383.259086] ? rvt_poll_cq+0x1e1/0x340 [rdmavt]
> [ 1383.266362] __ib_process_cq+0x97/0x100 [ib_core]
> [ 1383.273822] ib_cq_poll_work+0x31/0xb0 [ib_core]
> [ 1383.281169] process_one_work+0x4ee/0xa00
> [ 1383.287822] ? pwq_dec_nr_in_flight+0x110/0x110
> [ 1383.295047] ? do_raw_spin_lock+0x113/0x1d0
> [ 1383.301880] worker_thread+0x57/0x5a0
> [ 1383.308138] ? process_one_work+0xa00/0xa00
> [ 1383.314937] kthread+0x1bb/0x1e0
> [ 1383.320643] ? kthread_create_on_node+0xc0/0xc0
> [ 1383.327822] ret_from_fork+0x3a/0x50
> [ 1383.333928]
> [ 1383.337640] The buggy address belongs to the page:
> [ 1383.345080] page:ffffea000d8b5dc0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0
> [ 1383.356490] flags: 0x17ffffc0000000()
> [ 1383.362705] raw: 0017ffffc0000000 0000000000000000 ffffea000d8b5dc8 0000000000000000
> [ 1383.373530] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
> [ 1383.384321] page dumped because: kasan: bad access detected
> [ 1383.392659]
> [ 1383.396350] addr ffff888362d778d0 is located in stack of task kworker/u308:2/1889 at offset 32 in frame:
> [ 1383.409191] pma_get_opa_portstatus+0x0/0xa80 [hfi1]
> [ 1383.416843]
> [ 1383.420497] this frame has 1 object:
> [ 1383.426494] [32, 36) 'vl_select_mask'
> [ 1383.426495]
> [ 1383.436313] Memory state around the buggy address:
> [ 1383.443706] ffff888362d77780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> [ 1383.453865] ffff888362d77800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> [ 1383.464033] >ffff888362d77880: 00 00 00 00 00 00 f1 f1 f1 f1 04 f2 f2 f2 00 00
> [ 1383.474199] ^
> [ 1383.482828] ffff888362d77900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> [ 1383.493071] ffff888362d77980: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 04 f2 f2 f2
> [ 1383.503314]
> ==================================================================
>
> Cc: <stable@xxxxxxxxxxxxxxx>
> Reviewed-by: Mike Marciniszyn <mike.marciniszyn@xxxxxxxxx>
This needs a fixes line, can you tell me what it is?
> - for_each_set_bit(vl, (unsigned long *)&(vl_all_mask),
> - 8 * sizeof(vl_all_mask)) {
Well, that was obviously wrong!
Jason
