This fixes an oops caused by buslogic driver when initializing a BusLogic MultiMaster adapter. Initialization code used scope of a variable incorrectly which created a NULL pointer. Oops message is below: BUG: unable to handle kernel NULL pointer dereference at 0000000c IP: [] blogic_init_mm_probeinfo.isra.17+0x20a/0x583 *pde = 00000000 Oops: 002 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 1 Comm: swapper/0 Not tainted 3.11.1.puz1 #1 Hardware name: /Canterwood, BIOS 6.00 PG 05/16/2003 task: f7050000 ti: f7054000 task.ti: f7054000 EIP: 0060:[] EFLAGS: 00010246 CPU:1 EIP is at blogic_init_mm_probeinfo.isra.17+0x20a/0x583 EAX: 00000013 EBX: 00000000 ECX: 00000000 EDX: f8001000 ESI: f71cb800 EDI: f7388000 EBP: 00007800 ESP: f7055c84 DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 CR0: 8005003b CR2: 0000000c CR3: 0154f000 CR4: 000007d0 Stack: 0000001c 00000000 c11a59f6 f7055c98 00008130 ffffffff ffffffff 00000000 00000003 00000000 00000000 00000000 00000013 f8001000 00000001 000003d0 00000000 00000000 00000000 c14e3f84 f78803c8 00000000 f738c000 000000e9 Call Trace: [] ? pci_get_subsys+0x33/0x38 [] ? blogic_init_probeinfo_list+0x4b/0x19e [] ? __alloc_pages_nodemask+0xe3/0x623 [] ? __alloc_pages_nodemask+0xe3/0x623 [] ? sysfs_link_sibling+0x61/0x8d [] ? kmem_cache_alloc+0x8b/0xb5 [] ? blogic_init+0xa1/0x10e8 [] ? sysfs_add_one+0x10/0x9d [] ? sysfs_addrm_finish+0x12/0x85 [] ? sysfs_do_create_link_sd+0x9d/0x1b4 [] ? blk_register_queue+0x69/0xb3 [] ? sysfs_create_link+0x1a/0x2c [] ? add_disk+0x1a1/0x3c7 [] ? klist_next+0x60/0xc3 [] ? scsi_dh_detach+0x68/0x68 [] ? bus_for_each_dev+0x51/0x61 [] ? do_one_initcall+0x22/0x12c [] ? __proc_create+0x8c/0xba [] ? blogic_setup+0x5f6/0x5f6 [] ? repair_env_string+0xf/0x4d [] ? do_early_param+0x71/0x71 [] ? parse_args+0x21f/0x33d [] ? kernel_init_freeable+0xdf/0x17d [] ? do_early_param+0x71/0x71 [] ? kernel_init+0x8/0xc0 [] ? ret_from_kernel_thread+0x6/0x28 [] ? ret_from_kernel_thread+0x1b/0x28 [] ? rest_init+0x6c/0x6c Code: 89 44 24 10 0f b6 44 24 3d 89 44 24 0c c7 44 24 08 00 00 00 00 c7 44 24 04 38 62 46 c1 c7 04 24 02 00 00 00 e8 78 13 d2 ff 31 db <89> 6b 0c b0 20 89 ea ee c7 44 24 08 04 00 00 00 8d 44 24 4c 89 EIP: [] blogic_init_mm_probeinfo.isra.17+0x20a/0x583 SS:ESP 0068:f7055c84 CR2: 000000000000000c ---[ end trace 17f45f5196d40487 ]--- Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009 Signed-off-by: Khalid Aziz Cc: # 3.11.x Cc: Khalid Aziz Reported-by: Pierre Uszynski Tested-by: Pierre Uszynski --- drivers/scsi/BusLogic.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/drivers/scsi/BusLogic.c b/drivers/scsi/BusLogic.c index feab3a5..757eb07 100644 --- a/drivers/scsi/BusLogic.c +++ b/drivers/scsi/BusLogic.c @@ -696,7 +696,7 @@ static int __init blogic_init_mm_probeinfo(struct blogic_adapter *adapter) while ((pci_device = pci_get_device(PCI_VENDOR_ID_BUSLOGIC, PCI_DEVICE_ID_BUSLOGIC_MULTIMASTER, pci_device)) != NULL) { - struct blogic_adapter *adapter = adapter; + struct blogic_adapter *host_adapter = adapter; struct blogic_adapter_info adapter_info; enum blogic_isa_ioport mod_ioaddr_req; unsigned char bus; @@ -744,9 +744,9 @@ static int __init blogic_init_mm_probeinfo(struct blogic_adapter *adapter) known and enabled, note that the particular Standard ISA I/O Address should not be probed. */ - adapter->io_addr = io_addr; - blogic_intreset(adapter); - if (blogic_cmd(adapter, BLOGIC_INQ_PCI_INFO, NULL, 0, + host_adapter->io_addr = io_addr; + blogic_intreset(host_adapter); + if (blogic_cmd(host_adapter, BLOGIC_INQ_PCI_INFO, NULL, 0, &adapter_info, sizeof(adapter_info)) == sizeof(adapter_info)) { if (adapter_info.isa_port < 6) @@ -762,7 +762,7 @@ static int __init blogic_init_mm_probeinfo(struct blogic_adapter *adapter) I/O Address assigned at system initialization. */ mod_ioaddr_req = BLOGIC_IO_DISABLE; - blogic_cmd(adapter, BLOGIC_MOD_IOADDR, &mod_ioaddr_req, + blogic_cmd(host_adapter, BLOGIC_MOD_IOADDR, &mod_ioaddr_req, sizeof(mod_ioaddr_req), NULL, 0); /* For the first MultiMaster Host Adapter enumerated, @@ -779,12 +779,12 @@ static int __init blogic_init_mm_probeinfo(struct blogic_adapter *adapter) fetch_localram.offset = BLOGIC_AUTOSCSI_BASE + 45; fetch_localram.count = sizeof(autoscsi_byte45); - blogic_cmd(adapter, BLOGIC_FETCH_LOCALRAM, + blogic_cmd(host_adapter, BLOGIC_FETCH_LOCALRAM, &fetch_localram, sizeof(fetch_localram), &autoscsi_byte45, sizeof(autoscsi_byte45)); - blogic_cmd(adapter, BLOGIC_GET_BOARD_ID, NULL, 0, &id, - sizeof(id)); + blogic_cmd(host_adapter, BLOGIC_GET_BOARD_ID, NULL, 0, + &id, sizeof(id)); if (id.fw_ver_digit1 == '5') force_scan_order = autoscsi_byte45.force_scan_order; -- 1.7.10.4