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rt2x00usb: fix anchor initialization

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commit 0488a6121dfe6cbd44de15ea3627913b7549a1e9 upstream.

If device fail to initialize we can OOPS in rt2x00lib_remove_dev(), due
to using uninitialized usb_anchor structure:

[  855.435820] ieee80211 phy3: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1000 with error -19
[  855.435826] ieee80211 phy3: rt2800_probe_rt: Error - Invalid RT chipset 0x0000, rev 0000 detected
[  855.435829] ieee80211 phy3: rt2x00lib_probe_dev: Error - Failed to allocate device
[  855.435845] BUG: unable to handle kernel NULL pointer dereference at 0000000000000028
[  855.435900] IP: _raw_spin_lock_irq+0xd/0x30
[  855.435926] PGD 0
[  855.435953] Oops: 0002 [#1] SMP
<snip>
[  855.437011] Call Trace:
[  855.437029]  ? usb_kill_anchored_urbs+0x27/0xc0
[  855.437061]  rt2x00lib_remove_dev+0x190/0x1c0 [rt2x00lib]
[  855.437097]  rt2x00lib_probe_dev+0x246/0x7a0 [rt2x00lib]
[  855.437149]  ? ieee80211_roc_setup+0x9e/0xd0 [mac80211]
[  855.437183]  ? __kmalloc+0x1af/0x1f0
[  855.437207]  ? rt2x00usb_probe+0x13d/0xc50 [rt2x00usb]
[  855.437240]  rt2x00usb_probe+0x155/0xc50 [rt2x00usb]
[  855.437273]  rt2800usb_probe+0x15/0x20 [rt2800usb]
[  855.437304]  usb_probe_interface+0x159/0x2d0
[  855.437333]  driver_probe_device+0x2bb/0x460

Patch changes initialization sequence to fix the problem.

Cc: Vishal Thanki <vishalthanki@gmail.com>
Fixes: 8b4c0009313f ("rt2x00usb: Use usb anchor to manage URB")
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Cc: Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stanislaw Gruszka 2017-02-08 12:18:10 +01:00 committed by Greg Kroah-Hartman
parent 938f8e8560
commit cb794d5793
1 changed files with 8 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/net/wireless/ralink/rt2x00/rt2x00usb.c
View File

@ -824,10 +824,6 @@ int rt2x00usb_probe(struct usb_interface *usb_intf,
if (retval)
goto exit_free_device;
retval = rt2x00lib_probe_dev(rt2x00dev);
if (retval)
goto exit_free_reg;
rt2x00dev->anchor = devm_kmalloc(&usb_dev->dev,
sizeof(struct usb_anchor),
GFP_KERNEL);
@ -835,10 +831,17 @@ int rt2x00usb_probe(struct usb_interface *usb_intf,
retval = -ENOMEM;
goto exit_free_reg;
}
init_usb_anchor(rt2x00dev->anchor);
retval = rt2x00lib_probe_dev(rt2x00dev);
if (retval)
goto exit_free_anchor;
return 0;
exit_free_anchor:
usb_kill_anchored_urbs(rt2x00dev->anchor);
exit_free_reg:
rt2x00usb_free_reg(rt2x00dev);