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Today's Topics:
1. Re: [PATCH] rt2800usb: Don't perform DMA from stack (Helmut Schaa)
----------------------------------------------------------------------
Message: 1
Date: Mon, 7 Jul 2014 09:42:56 +0200
From: Helmut Schaa <[email protected]>
To: Andrea Merello <[email protected]>
Cc: Xose Vazquez Perez <[email protected]>, linux-wireless
<[email protected]>, rt2x00 Users List
<[email protected]>, [email protected]
Subject: Re: [rt2x00-users] [PATCH] rt2800usb: Don't perform DMA from
stack
Message-ID:
<cagxe3d-o0xvzc4sq+hatrvh3yk-8m7pvfejrw9h4s0wjf44...@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8
On Sat, Jul 5, 2014 at 9:07 PM, Andrea Merello <[email protected]> wrote:
> Function rt2800usb_autorun_detect() passes the address of a variable
> allocated onto the stack to be used for DMA by the USB layer. This has
> been caught by my debugging-enabled kernel.
>
> This patch change things in order to allocate that variable via
> kmalloc, and it adjusts things to handle the kmalloc failure case,
> propagating the error.
>
> [ 7363.238852] ------------[ cut here ]------------
> [ 7363.243529] WARNING: CPU: 1 PID: 5235 at lib/dma-debug.c:1153
> check_for_stack+0xa4/0xf0()
> [ 7363.251759] ehci-pci 0000:00:04.1: DMA-API: device driver maps memory
> fromstack [addr=ffff88006b81bad4]
> [ 7363.261210] Modules linked in: rt2800usb(O+) rt2800lib(O) rt2x00usb(O)
> rt2x00lib(O) rtl818x_pci(O) rtl8187 led_class eeprom_93cx6 mac80211 cfg80211
> [last unloaded: rt2x00lib]
> [ 7363.277143] CPU: 1 PID: 5235 Comm: systemd-udevd Tainted: G O
> 3.16.0-rc3-wl+ #31
> [ 7363.285546] Hardware name: System manufacturer System Product Name/M3N78
> PRO, BIOS ASUS M3N78 PRO ACPI BIOS Revision 1402 12/04/2009
> [ 7363.297511] 0000000000000009 ffff88006b81b710 ffffffff8175dcad
> ffff88006b81b758
> [ 7363.305062] ffff88006b81b748 ffffffff8106d372 ffff88006cf10098
> ffff88006cead6a0
> [ 7363.312622] ffff88006b81bad4 ffffffff81c1e7c0 ffff88006cf10098
> ffff88006b81b7a8
> [ 7363.320161] Call Trace:
> [ 7363.322661] [<ffffffff8175dcad>] dump_stack+0x4d/0x6f
> [ 7363.327847] [<ffffffff8106d372>] warn_slowpath_common+0x82/0xb0
> [ 7363.333893] [<ffffffff8106d3e7>] warn_slowpath_fmt+0x47/0x50
> [ 7363.339686] [<ffffffff813a93b4>] check_for_stack+0xa4/0xf0
> [ 7363.345298] [<ffffffff813a995c>] debug_dma_map_page+0x10c/0x150
> [ 7363.351367] [<ffffffff81521bd9>] usb_hcd_map_urb_for_dma+0x229/0x720
> [ 7363.357890] [<ffffffff8152256d>] usb_hcd_submit_urb+0x2fd/0x930
> [ 7363.363929] [<ffffffff810eac31>] ? irq_work_queue+0x71/0xd0
> [ 7363.369617] [<ffffffff810ab5a7>] ? wake_up_klogd+0x37/0x50
> [ 7363.375219] [<ffffffff810ab7a5>] ? console_unlock+0x1e5/0x420
> [ 7363.381081] [<ffffffff810abc25>] ? vprintk_emit+0x245/0x530
> [ 7363.386773] [<ffffffff81523d3c>] usb_submit_urb+0x30c/0x580
> [ 7363.392462] [<ffffffff81524295>] usb_start_wait_urb+0x65/0xf0
> [ 7363.398325] [<ffffffff815243ed>] usb_control_msg+0xcd/0x110
> [ 7363.404014] [<ffffffffa005514d>] rt2x00usb_vendor_request+0xbd/0x170
> [rt2x00usb]
> [ 7363.411544] [<ffffffffa0074292>] rt2800usb_autorun_detect+0x32/0x50
> [rt2800usb]
> [ 7363.418986] [<ffffffffa0074aa1>] rt2800usb_read_eeprom+0x11/0x70
> [rt2800usb]
> [ 7363.426168] [<ffffffffa0063ffd>] rt2800_probe_hw+0x11d/0xf90 [rt2800lib]
> [ 7363.432989] [<ffffffffa0074b7d>] rt2800usb_probe_hw+0xd/0x50 [rt2800usb]
> [ 7363.439808] [<ffffffffa00453d8>] rt2x00lib_probe_dev+0x238/0x7c0
> [rt2x00lib]
> [ 7363.446992] [<ffffffffa00bfa48>] ? ieee80211_led_names+0xb8/0x100
> [mac80211]
> [ 7363.454156] [<ffffffffa0056116>] rt2x00usb_probe+0x156/0x1f0 [rt2x00usb]
> [ 7363.460971] [<ffffffffa0074250>] rt2800usb_probe+0x10/0x20 [rt2800usb]
> [ 7363.467616] [<ffffffff8152799e>] usb_probe_interface+0xce/0x1c0
> [ 7363.473651] [<ffffffff81480c20>] really_probe+0x70/0x240
> [ 7363.479079] [<ffffffff81480f01>] __driver_attach+0xa1/0xb0
> [ 7363.484682] [<ffffffff81480e60>] ? __device_attach+0x70/0x70
> [ 7363.490461] [<ffffffff8147eef3>] bus_for_each_dev+0x63/0xa0
> [ 7363.496146] [<ffffffff814807c9>] driver_attach+0x19/0x20
> [ 7363.501570] [<ffffffff81480468>] bus_add_driver+0x178/0x220
> [ 7363.507270] [<ffffffff8148151b>] driver_register+0x5b/0xe0
> [ 7363.512874] [<ffffffff815271b0>] usb_register_driver+0xa0/0x170
> [ 7363.518905] [<ffffffffa007a000>] ? 0xffffffffa0079fff
> [ 7363.524074] [<ffffffffa007a01e>] rt2800usb_driver_init+0x1e/0x20
> [rt2800usb]
> [ 7363.531247] [<ffffffff810002d4>] do_one_initcall+0x84/0x1b0
> [ 7363.536932] [<ffffffff8113aa60>] ? kfree+0xd0/0x110
> [ 7363.541931] [<ffffffff8112730a>] ? __vunmap+0xaa/0xf0
> [ 7363.547538] [<ffffffff810ca07e>] load_module+0x1aee/0x2040
> [ 7363.553141] [<ffffffff810c6f10>] ? store_uevent+0x50/0x50
> [ 7363.558676] [<ffffffff810ca66e>] SyS_init_module+0x9e/0xc0
> [ 7363.564285] [<ffffffff81764012>] system_call_fastpath+0x16/0x1b
> [ 7363.570338] ---[ end trace 01ef5f822bea9882 ]---
>
> Signed-off-by: Andrea Merello <[email protected]>
Acked-by: Helmut Schaa <[email protected]>
Really good catch!
Thanks a lot Andrea.
------------------------------
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