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

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Message-ID: <DS4PPF7551E6552CD63288F6FA9A865F968E506A@DS4PPF7551E6552.namprd11.prod.outlook.com>
Date: Tue, 2 Sep 2025 08:35:45 +0000
From: "Loktionov, Aleksandr" <aleksandr.loktionov@...el.com>
To: "Jagielski, Jedrzej" <jedrzej.jagielski@...el.com>, 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>, "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: [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 Jagielski, Jedrzej
> Sent: Tuesday, September 2, 2025 9:45 AM
> To: Koichiro Den <den@...inux.co.jp>; 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;
> mateusz.polchlopek@...el.com; netdev@...r.kernel.org; linux-
> kernel@...r.kernel.org
> Subject: Re: [Intel-wired-lan] [PATCH v2] ixgbe: fix too early
> devlink_free() in ixgbe_remove()
> 
> >From: Koichiro Den <den@...inux.co.jp>
> >Sent: Tuesday, September 2, 2025 2:40 AM
> >
> >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(-)
> >
> >diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> >b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> >index 80e6a2ef1350..b3822c229300 100644
> >--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> >+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> >@@ -12092,7 +12092,6 @@ static void ixgbe_remove(struct pci_dev
> *pdev)
> >
> > 	devl_port_unregister(&adapter->devlink_port);
> > 	devl_unlock(adapter->devlink);
> >-	devlink_free(adapter->devlink);
> >
> > 	ixgbe_stop_ipsec_offload(adapter);
> > 	ixgbe_clear_interrupt_scheme(adapter);
> >@@ -12125,6 +12124,8 @@ static void ixgbe_remove(struct pci_dev
> *pdev)
> >
> > 	if (disable_dev)
> > 		pci_disable_device(pdev);
> >+
> >+	devlink_free(adapter->devlink);
> > }
> >
> > /**
> >--
> >2.48.1
> 
> Reviewed-by: Jedrzej Jagielski <jedrzej.jagielski@...el.com>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@...el.com>