netdev - RE: [Intel-wired-lan] [PATCH v2] ixgbe: fix too early devlink_free() in ixgbe

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Message-ID: <IA1PR11MB624143ECF3E9827B7325588F8B17A@IA1PR11MB6241.namprd11.prod.outlook.com>
Date: Wed, 17 Sep 2025 07:44:53 +0000
From: "Rinitha, SX" <sx.rinitha@...el.com>
To: Koichiro Den <den@...inux.co.jp>, "intel-wired-lan@...ts.osuosl.org"
	<intel-wired-lan@...ts.osuosl.org>
CC: "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>, "Kitszel, Przemyslaw"
	<przemyslaw.kitszel@...el.com>, "andrew+netdev@...n.ch"
	<andrew+netdev@...n.ch>, "Jagielski, Jedrzej" <jedrzej.jagielski@...el.com>,
	"mateusz.polchlopek@...el.com" <mateusz.polchlopek@...el.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [Intel-wired-lan] [PATCH v2] ixgbe: fix too early devlink_free()
 in ixgbe_remove()

> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of Koichiro Den
> Sent: 02 September 2025 06:10
> To: intel-wired-lan@...ts.osuosl.org
> Cc: Nguyen, Anthony L <anthony.l.nguyen@...el.com>; Kitszel, Przemyslaw <przemyslaw.kitszel@...el.com>; andrew+netdev@...n.ch; Jagielski, Jedrzej <jedrzej.jagielski@...el.com>; mateusz.polchlopek@...el.com; netdev@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: [Intel-wired-lan] [PATCH v2] ixgbe: fix too early devlink_free() in ixgbe_remove()
>
> Since ixgbe_adapter is embedded in devlink, calling devlink_free() prematurely in the ixgbe_remove() path can lead to UAF. Move devlink_free() to the end.
>
> KASAN report:
>
> BUG: KASAN: use-after-free in ixgbe_reset_interrupt_capability+0x140/0x180 [ixgbe]  Read of size 8 at addr ffff0000adf813e0 by task bash/2095
> CPU: 1 UID: 0 PID: 2095 Comm: bash Tainted: G S  6.17.0-rc2-tnguy.net-queue+ #1 PREEMPT(full)  [...]  Call trace:
>  show_stack+0x30/0x90 (C)
>  dump_stack_lvl+0x9c/0xd0
>  print_address_description.constprop.0+0x90/0x310
>  print_report+0x104/0x1f0
>  kasan_report+0x88/0x180
>  __asan_report_load8_noabort+0x20/0x30
>  ixgbe_reset_interrupt_capability+0x140/0x180 [ixgbe]
>  ixgbe_clear_interrupt_scheme+0xf8/0x130 [ixgbe]
>  ixgbe_remove+0x2d0/0x8c0 [ixgbe]
>  pci_device_remove+0xa0/0x220
>  device_remove+0xb8/0x170
> device_release_driver_internal+0x318/0x490
> device_driver_detach+0x40/0x68
>  unbind_store+0xec/0x118
>  drv_attr_store+0x64/0xb8
>  sysfs_kf_write+0xcc/0x138
>  kernfs_fop_write_iter+0x294/0x440
> new_sync_write+0x1fc/0x588
>  vfs_write+0x480/0x6a0
>  ksys_write+0xf0/0x1e0
>  __arm64_sys_write+0x70/0xc0
>  invoke_syscall.constprop.0+0xcc/0x280
>  el0_svc_common.constprop.0+0xa8/0x248
>  do_el0_svc+0x44/0x68
>  el0_svc+0x54/0x160
>  el0t_64_sync_handler+0xa0/0xe8
>  el0t_64_sync+0x1b0/0x1b8
>
> Fixes: a0285236ab93 ("ixgbe: add initial devlink support")
> Signed-off-by: Koichiro Den <den@...inux.co.jp>
> ---
> Changes in v2:
> - Move only devlink_free()
> ---
> drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>

Tested-by: Rinitha S <sx.rinitha@...el.com> (A Contingent worker at Intel)