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Subject[PATCH] atm: lanai: dont run lanai_dev_close if not open
Date
lanai_dev_open() can fail. When it fail, lanai->base is unmapped and the
pci device is disabled. The caller, lanai_init_one(), then tries to run
atm_dev_deregister(). This will subsequently call lanai_dev_close() and
use the already released MMIO area.

To fix this issue, set the lanai->base to NULL if open fail,
and test the flag in lanai_dev_close().

[ 8.324153] lanai: lanai_start() failed, err=19
[ 8.324819] lanai(itf 0): shutting down interface
[ 8.325211] BUG: unable to handle page fault for address: ffffc90000180024
[ 8.325781] #PF: supervisor write access in kernel mode
[ 8.326215] #PF: error_code(0x0002) - not-present page
[ 8.326641] PGD 100000067 P4D 100000067 PUD 100139067 PMD 10013a067 PTE 0
[ 8.327206] Oops: 0002 [#1] SMP KASAN NOPTI
[ 8.327557] CPU: 0 PID: 95 Comm: modprobe Not tainted 5.11.0-rc7-00090-gdcc0b49040c7 #12
[ 8.328229] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-48-gd9c812dda519-4
[ 8.329145] RIP: 0010:lanai_dev_close+0x4f/0xe5 [lanai]
[ 8.329587] Code: 00 48 c7 c7 00 d3 01 c0 e8 49 4e 0a c2 48 8d bd 08 02 00 00 e8 6e 52 14 c1 48 80
[ 8.330917] RSP: 0018:ffff8881029ef680 EFLAGS: 00010246
[ 8.331196] RAX: 000000000003fffe RBX: ffff888102fb4800 RCX: ffffffffc001a98a
[ 8.331572] RDX: ffffc90000180000 RSI: 0000000000000246 RDI: ffff888102fb4000
[ 8.331948] RBP: ffff888102fb4000 R08: ffffffff8115da8a R09: ffffed102053deaa
[ 8.332326] R10: 0000000000000003 R11: ffffed102053dea9 R12: ffff888102fb48a4
[ 8.332701] R13: ffffffffc00123c0 R14: ffff888102fb4b90 R15: ffff888102fb4b88
[ 8.333077] FS: 00007f08eb9056a0(0000) GS:ffff88815b400000(0000) knlGS:0000000000000000
[ 8.333502] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 8.333806] CR2: ffffc90000180024 CR3: 0000000102a28000 CR4: 00000000000006f0
[ 8.334182] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 8.334557] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 8.334932] Call Trace:
[ 8.335066] atm_dev_deregister+0x161/0x1a0 [atm]
[ 8.335324] lanai_init_one.cold+0x20c/0x96d [lanai]
[ 8.335594] ? lanai_send+0x2a0/0x2a0 [lanai]
[ 8.335831] local_pci_probe+0x6f/0xb0
[ 8.336039] pci_device_probe+0x171/0x240
[ 8.336255] ? pci_device_remove+0xe0/0xe0
[ 8.336475] ? kernfs_create_link+0xb6/0x110
[ 8.336704] ? sysfs_do_create_link_sd.isra.0+0x76/0xe0
[ 8.336983] really_probe+0x161/0x420
[ 8.337181] driver_probe_device+0x6d/0xd0
[ 8.337401] device_driver_attach+0x82/0x90
[ 8.337626] ? device_driver_attach+0x90/0x90
[ 8.337859] __driver_attach+0x60/0x100
[ 8.338065] ? device_driver_attach+0x90/0x90
[ 8.338298] bus_for_each_dev+0xe1/0x140
[ 8.338511] ? subsys_dev_iter_exit+0x10/0x10
[ 8.338745] ? klist_node_init+0x61/0x80
[ 8.338956] bus_add_driver+0x254/0x2a0
[ 8.339164] driver_register+0xd3/0x150
[ 8.339370] ? 0xffffffffc0028000
[ 8.339550] do_one_initcall+0x84/0x250
[ 8.339755] ? trace_event_raw_event_initcall_finish+0x150/0x150
[ 8.340076] ? free_vmap_area_noflush+0x1a5/0x5c0
[ 8.340329] ? unpoison_range+0xf/0x30
[ 8.340532] ? ____kasan_kmalloc.constprop.0+0x84/0xa0
[ 8.340806] ? unpoison_range+0xf/0x30
[ 8.341014] ? unpoison_range+0xf/0x30
[ 8.341217] do_init_module+0xf8/0x350
[ 8.341419] load_module+0x3fe6/0x4340
[ 8.341621] ? vm_unmap_ram+0x1d0/0x1d0
[ 8.341826] ? ____kasan_kmalloc.constprop.0+0x84/0xa0
[ 8.342101] ? module_frob_arch_sections+0x20/0x20
[ 8.342358] ? __do_sys_finit_module+0x108/0x170
[ 8.342604] __do_sys_finit_module+0x108/0x170
[ 8.342841] ? __ia32_sys_init_module+0x40/0x40
[ 8.343083] ? file_open_root+0x200/0x200
[ 8.343298] ? do_sys_open+0x85/0xe0
[ 8.343491] ? filp_open+0x50/0x50
[ 8.343675] ? exit_to_user_mode_prepare+0xfc/0x130
[ 8.343935] do_syscall_64+0x33/0x40
[ 8.344132] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 8.344401] RIP: 0033:0x7f08eb887cf7
[ 8.344594] Code: 48 89 57 30 48 8b 04 24 48 89 47 38 e9 1d a0 02 00 48 89 f8 48 89 f7 48 89 d6 41
[ 8.345565] RSP: 002b:00007ffcd5c98ad8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[ 8.345962] RAX: ffffffffffffffda RBX: 00000000008fea70 RCX: 00007f08eb887cf7
[ 8.346336] RDX: 0000000000000000 RSI: 00000000008fd9e0 RDI: 0000000000000003
[ 8.346711] RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000001
[ 8.347085] R10: 00007f08eb8eb300 R11: 0000000000000246 R12: 00000000008fd9e0
[ 8.347460] R13: 0000000000000000 R14: 00000000008fddd0 R15: 0000000000000001
[ 8.347836] Modules linked in: lanai(+) atm
[ 8.348065] CR2: ffffc90000180024
[ 8.348244] ---[ end trace 7fdc1c668f2003e5 ]---
[ 8.348490] RIP: 0010:lanai_dev_close+0x4f/0xe5 [lanai]
[ 8.348772] Code: 00 48 c7 c7 00 d3 01 c0 e8 49 4e 0a c2 48 8d bd 08 02 00 00 e8 6e 52 14 c1 48 80
[ 8.349745] RSP: 0018:ffff8881029ef680 EFLAGS: 00010246
[ 8.350022] RAX: 000000000003fffe RBX: ffff888102fb4800 RCX: ffffffffc001a98a
[ 8.350397] RDX: ffffc90000180000 RSI: 0000000000000246 RDI: ffff888102fb4000
[ 8.350772] RBP: ffff888102fb4000 R08: ffffffff8115da8a R09: ffffed102053deaa
[ 8.351151] R10: 0000000000000003 R11: ffffed102053dea9 R12: ffff888102fb48a4
[ 8.351525] R13: ffffffffc00123c0 R14: ffff888102fb4b90 R15: ffff888102fb4b88
[ 8.351918] FS: 00007f08eb9056a0(0000) GS:ffff88815b400000(0000) knlGS:0000000000000000
[ 8.352343] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 8.352647] CR2: ffffc90000180024 CR3: 0000000102a28000 CR4: 00000000000006f0
[ 8.353022] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 8.353397] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 8.353958] modprobe (95) used greatest stack depth: 26216 bytes left

Signed-off-by: Tong Zhang <ztong0001@gmail.com>
---
drivers/atm/lanai.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/atm/lanai.c b/drivers/atm/lanai.c
index d7277c26e423..32d7aa141d96 100644
--- a/drivers/atm/lanai.c
+++ b/drivers/atm/lanai.c
@@ -2233,6 +2233,7 @@ static int lanai_dev_open(struct atm_dev *atmdev)
conf1_write(lanai);
#endif
iounmap(lanai->base);
+ lanai->base = NULL;
error_pci:
pci_disable_device(lanai->pci);
error:
@@ -2245,6 +2246,8 @@ static int lanai_dev_open(struct atm_dev *atmdev)
static void lanai_dev_close(struct atm_dev *atmdev)
{
struct lanai_dev *lanai = (struct lanai_dev *) atmdev->dev_data;
+ if (lanai->base==NULL)
+ return;
printk(KERN_INFO DEV_LABEL "(itf %d): shutting down interface\n",
lanai->number);
lanai_timed_poll_stop(lanai);
@@ -2552,7 +2555,7 @@ static int lanai_init_one(struct pci_dev *pci,
struct atm_dev *atmdev;
int result;

- lanai = kmalloc(sizeof(*lanai), GFP_KERNEL);
+ lanai = kzalloc(sizeof(*lanai), GFP_KERNEL);
if (lanai == NULL) {
printk(KERN_ERR DEV_LABEL
": couldn't allocate dev_data structure!\n");
--
2.25.1
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