Re: [PATCH] qla2xxx: Fix NULL pointer deref in QLA interrupt

[Johannes Thumshirn]

On Thu, Jun 30, 2016 at 05:00:32PM +0200, Bruno Prémont wrote:
> In qla24xx_process_response_queue() rsp->msix->cpuid may trigger NULL
> pointer dereference when rsp->msix is NULL:
> 
> [    5.622457] NULL pointer dereference at 0000000000000050
> [    5.622457] IP: [<ffffffff8155e614>] qla24xx_process_response_queue+0x44/0x4b0
> [    5.622457] PGD 0
> [    5.622457] Oops: 0000 [#1] SMP
> [    5.622457] Modules linked in:
> [    5.622457] CPU: 2 PID: 0 Comm: swapper/2 Not tainted 4.6.3-x86_64 #1
> [    5.622457] Hardware name: HP ProLiant DL360 G5, BIOS P58 05/02/2011
> [    5.622457] task: ffff8801a88f3740 ti: ffff8801a8954000 task.ti: ffff8801a8954000
> [    5.622457] RIP: 0010:[<ffffffff8155e614>]  [<ffffffff8155e614>] qla24xx_process_response_queue+0x44/0x4b0
> [    5.622457] RSP: 0000:ffff8801afb03de8  EFLAGS: 00010002
> [    5.622457] RAX: 0000000000000000 RBX: 0000000000000032 RCX: 00000000ffffffff
> [    5.622457] RDX: 0000000000000002 RSI: ffff8801a79bf8c8 RDI: ffff8800c8f7e7c0
> [    5.622457] RBP: ffff8801afb03e68 R08: 0000000000000000 R09: 0000000000000000
> [    5.622457] R10: 00000000ffff8c47 R11: 0000000000000002 R12: ffff8801a79bf8c8
> [    5.622457] R13: ffff8800c8f7e7c0 R14: ffff8800c8f60000 R15: 0000000000018013
> [    5.622457] FS:  0000000000000000(0000) GS:ffff8801afb00000(0000) knlGS:0000000000000000
> [    5.622457] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [    5.622457] CR2: 0000000000000050 CR3: 0000000001e07000 CR4: 00000000000006e0
> [    5.622457] Stack:
> [    5.622457]  ffff8801afb03e30 ffffffff810c0f2d 0000000000000086 0000000000000002
> [    5.622457]  ffff8801afb03e28 ffffffff816570e1 ffff8800c8994628 0000000000000002
> [    5.622457]  ffff8801afb03e60 ffffffff816772d4 b47c472ad6955e68 0000000000000032
> [    5.622457] Call Trace:
> [    5.622457]  <IRQ>
> [    5.622457]  [<ffffffff810c0f2d>] ? __wake_up_common+0x4d/0x80
> [    5.622457]  [<ffffffff816570e1>] ? usb_hcd_resume_root_hub+0x51/0x60
> [    5.622457]  [<ffffffff816772d4>] ? uhci_hub_status_data+0x64/0x240
> [    5.622457]  [<ffffffff81560d00>] qla24xx_intr_handler+0xf0/0x2e0
> [    5.622457]  [<ffffffff810d569e>] ? get_next_timer_interrupt+0xce/0x200
> [    5.622457]  [<ffffffff810c89b4>] handle_irq_event_percpu+0x64/0x100
> [    5.622457]  [<ffffffff810c8a77>] handle_irq_event+0x27/0x50
> [    5.622457]  [<ffffffff810cb965>] handle_edge_irq+0x65/0x140
> [    5.622457]  [<ffffffff8101a498>] handle_irq+0x18/0x30
> [    5.622457]  [<ffffffff8101a276>] do_IRQ+0x46/0xd0
> [    5.622457]  [<ffffffff817f8fff>] common_interrupt+0x7f/0x7f
> [    5.622457]  <EOI>
> [    5.622457]  [<ffffffff81020d38>] ? mwait_idle+0x68/0x80
> [    5.622457]  [<ffffffff8102114a>] arch_cpu_idle+0xa/0x10
> [    5.622457]  [<ffffffff810c1b97>] default_idle_call+0x27/0x30
> [    5.622457]  [<ffffffff810c1d3b>] cpu_startup_entry+0x19b/0x230
> [    5.622457]  [<ffffffff810324c6>] start_secondary+0x136/0x140
> [    5.622457] Code: 00 00 65 48 8b 04 25 28 00 00 00 48 89 45 d0 31 c0 48 8b 47 58 a8 02 0f 84 c5 00 00 00 48 8b 46 50 49 89 f4 65 8b 15 34 bb aa 7e <39> 50 50 74 11 89 50 50 48 8b 46 50 8b 40 50 41 89 86 60 8b 00
> [    5.622457] RIP  [<ffffffff8155e614>] qla24xx_process_response_queue+0x44/0x4b0
> [    5.622457]  RSP <ffff8801afb03de8>
> [    5.622457] CR2: 0000000000000050
> [    5.622457] ---[ end trace fa2b19c25106d42b ]---
> [    5.622457] Kernel panic - not syncing: Fatal exception in interrupt
> 
> 
> The affected code was introduced by commit cdb898c52d1dfad4b4800b83a58b3fe5d352edde
> (qla2xxx: Add irq affinity notification).
> 
> Only dereference rsp->msix when it has been set so the machine can boot
> fine. Possibly rsp->msix is unset because:
> [    3.479679] qla2xxx [0000:00:00.0]-0005: : QLogic Fibre Channel HBA Driver: 8.07.00.33-k.
> [    3.481839] qla2xxx [0000:13:00.0]-001d: : Found an ISP2432 irq 17 iobase 0xffffc90000038000.
> [    3.484081] qla2xxx [0000:13:00.0]-0035:0: MSI-X; Unsupported ISP2432 (0x2, 0x3).
> [    3.485804] qla2xxx [0000:13:00.0]-0037:0: Falling back-to MSI mode -258.
> [    3.890145] scsi host0: qla2xxx
> [    3.891956] qla2xxx [0000:13:00.0]-00fb:0: QLogic QLE2460 - PCI-Express Single Channel 4Gb Fibre Channel HBA.
> [    3.894207] qla2xxx [0000:13:00.0]-00fc:0: ISP2432: PCIe (2.5GT/s x4) @ 0000:13:00.0 hdma+ host#=0 fw=7.03.00 (9496).
> [    5.714774] qla2xxx [0000:13:00.0]-500a:0: LOOP UP detected (4 Gbps).
> 
> 
> CC: <stable@xxxxxxxxxxxxxxx>
> Signed-off-by: Bruno Prémont <bonbons@xxxxxxxxxxxxxxxxx>

Reviewed-by: Johannes Thumshirn <jthumshirn@xxxxxxx>

-- 
Johannes Thumshirn                                          Storage
jthumshirn@xxxxxxx                                +49 911 74053 689
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