From 1ee0a224bc9aad1de496c795f96bc6ba2c394811 Mon Sep 17 00:00:00 2001 From: Wolfgang Frisch Date: Thu, 17 Jan 2013 01:07:02 +0100 Subject: [PATCH] USB: io_ti: Fix NULL dereference in chase_port() The tty is NULL when the port is hanging up. chase_port() needs to check for this. This patch is intended for stable series. The behavior was observed and tested in Linux 3.2 and 3.7.1. Johan Hovold submitted a more elaborate patch for the mainline kernel. [ 56.277883] usb 1-1: edge_bulk_in_callback - nonzero read bulk status received: -84 [ 56.278811] usb 1-1: USB disconnect, device number 3 [ 56.278856] usb 1-1: edge_bulk_in_callback - stopping read! [ 56.279562] BUG: unable to handle kernel NULL pointer dereference at 00000000000001c8 [ 56.280536] IP: [] _raw_spin_lock_irqsave+0x19/0x35 [ 56.281212] PGD 1dc1b067 PUD 1e0f7067 PMD 0 [ 56.282085] Oops: 0002 [#1] SMP [ 56.282744] Modules linked in: [ 56.283512] CPU 1 [ 56.283512] Pid: 25, comm: khubd Not tainted 3.7.1 #1 innotek GmbH VirtualBox/VirtualBox [ 56.283512] RIP: 0010:[] [] _raw_spin_lock_irqsave+0x19/0x35 [ 56.283512] RSP: 0018:ffff88001fa99ab0 EFLAGS: 00010046 [ 56.283512] RAX: 0000000000000046 RBX: 00000000000001c8 RCX: 0000000000640064 [ 56.283512] RDX: 0000000000010000 RSI: ffff88001fa99b20 RDI: 00000000000001c8 [ 56.283512] RBP: ffff88001fa99b20 R08: 0000000000000000 R09: 0000000000000000 [ 56.283512] R10: 0000000000000000 R11: ffffffff812fcb4c R12: ffff88001ddf53c0 [ 56.283512] R13: 0000000000000000 R14: 00000000000001c8 R15: ffff88001e19b9f4 [ 56.283512] FS: 0000000000000000(0000) GS:ffff88001fd00000(0000) knlGS:0000000000000000 [ 56.283512] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 56.283512] CR2: 00000000000001c8 CR3: 000000001dc51000 CR4: 00000000000006e0 [ 56.283512] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 56.283512] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 56.283512] Process khubd (pid: 25, threadinfo ffff88001fa98000, task ffff88001fa94f80) [ 56.283512] Stack: [ 56.283512] 0000000000000046 00000000000001c8 ffffffff810578ec ffffffff812fcb4c [ 56.283512] ffff88001e19b980 0000000000002710 ffffffff812ffe81 0000000000000001 [ 56.283512] ffff88001fa94f80 0000000000000202 ffffffff00000001 0000000000000296 [ 56.283512] Call Trace: [ 56.283512] [] ? add_wait_queue+0x12/0x3c [ 56.283512] [] ? usb_serial_port_work+0x28/0x28 [ 56.283512] [] ? chase_port+0x84/0x2d6 [ 56.283512] [] ? try_to_wake_up+0x199/0x199 [ 56.283512] [] ? tty_ldisc_hangup+0x222/0x298 [ 56.283512] [] ? edge_close+0x64/0x129 [ 56.283512] [] ? __wake_up+0x35/0x46 [ 56.283512] [] ? should_resched+0x5/0x23 [ 56.283512] [] ? tty_port_shutdown+0x39/0x44 [ 56.283512] [] ? usb_serial_port_work+0x28/0x28 [ 56.283512] [] ? __tty_hangup+0x307/0x351 [ 56.283512] [] ? usb_hcd_flush_endpoint+0xde/0xed [ 56.283512] [] ? _raw_spin_lock_irqsave+0x14/0x35 [ 56.283512] [] ? usb_serial_disconnect+0x57/0xc2 [ 56.283512] [] ? usb_unbind_interface+0x5c/0x131 [ 56.283512] [] ? __device_release_driver+0x7f/0xd5 [ 56.283512] [] ? device_release_driver+0x1a/0x25 [ 56.283512] [] ? bus_remove_device+0xd2/0xe7 [ 56.283512] [] ? device_del+0x119/0x167 [ 56.283512] [] ? usb_disable_device+0x6a/0x180 [ 56.283512] [] ? usb_disconnect+0x81/0xe6 [ 56.283512] [] ? hub_thread+0x577/0xe82 [ 56.283512] [] ? __schedule+0x490/0x4be [ 56.283512] [] ? abort_exclusive_wait+0x79/0x79 [ 56.283512] [] ? usb_remote_wakeup+0x2f/0x2f [ 56.283512] [] ? usb_remote_wakeup+0x2f/0x2f [ 56.283512] [] ? kthread+0x81/0x89 [ 56.283512] [] ? __kthread_parkme+0x5c/0x5c [ 56.283512] [] ? ret_from_fork+0x7c/0xb0 [ 56.283512] [] ? __kthread_parkme+0x5c/0x5c [ 56.283512] Code: 8b 7c 24 08 e8 17 0b c3 ff 48 8b 04 24 48 83 c4 10 c3 53 48 89 fb 41 50 e8 e0 0a c3 ff 48 89 04 24 e8 e7 0a c3 ff ba 00 00 01 00 0f c1 13 48 8b 04 24 89 d1 c1 ea 10 66 39 d1 74 07 f3 90 66 [ 56.283512] RIP [] _raw_spin_lock_irqsave+0x19/0x35 [ 56.283512] RSP [ 56.283512] CR2: 00000000000001c8 [ 56.283512] ---[ end trace 49714df27e1679ce ]--- Signed-off-by: Wolfgang Frisch Cc: Johan Hovold Cc: stable Signed-off-by: Greg Kroah-Hartman --- drivers/usb/serial/io_ti.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/usb/serial/io_ti.c b/drivers/usb/serial/io_ti.c index 58184f3de686..82afc4d6a327 100644 --- a/drivers/usb/serial/io_ti.c +++ b/drivers/usb/serial/io_ti.c @@ -530,6 +530,9 @@ static void chase_port(struct edgeport_port *port, unsigned long timeout, wait_queue_t wait; unsigned long flags; + if (!tty) + return; + if (!timeout) timeout = (HZ * EDGE_CLOSING_WAIT)/100; -- 2.34.1