linux-kernel - [PATCH net 8/8] ixgbe: fix too early devlink_free() in ixgbe

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Message-Id: <20251001-jk-iwl-net-2025-10-01-v1-8-49fa99e86600@intel.com>
Date: Wed, 01 Oct 2025 17:14:18 -0700
From: Jacob Keller <jacob.e.keller@...el.com>
To: Przemek Kitszel <przemyslaw.kitszel@...el.com>, 
 Andrew Lunn <andrew+netdev@...n.ch>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Emil Tantilov <emil.s.tantilov@...el.com>, 
 Pavan Kumar Linga <pavan.kumar.linga@...el.com>, 
 Alexander Lobakin <aleksander.lobakin@...el.com>, 
 Willem de Bruijn <willemb@...gle.com>, 
 Sridhar Samudrala <sridhar.samudrala@...el.com>, 
 Phani Burra <phani.r.burra@...el.com>, 
 Piotr Kwapulinski <piotr.kwapulinski@...el.com>, 
 Simon Horman <horms@...nel.org>, Radoslaw Tyl <radoslawx.tyl@...el.com>, 
 Jedrzej Jagielski <jedrzej.jagielski@...el.com>, 
 Mateusz Polchlopek <mateusz.polchlopek@...el.com>
Cc: Anton Nadezhdin <anton.nadezhdin@...el.com>, 
 Konstantin Ilichev <konstantin.ilichev@...el.com>, 
 Milena Olech <milena.olech@...el.com>, netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Jacob Keller <jacob.e.keller@...el.com>, 
 Koichiro Den <den@...inux.co.jp>, Rinitha S <sx.rinitha@...el.com>, 
 Aleksandr Loktionov <aleksandr.loktionov@...el.com>, 
 Paul Menzel <pmenzel@...gen.mpg.de>
Subject: [PATCH net 8/8] ixgbe: fix too early devlink_free() in
 ixgbe_remove()

From: Koichiro Den <den@...inux.co.jp>

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>
Tested-by: Rinitha S <sx.rinitha@...el.com>
Reviewed-by: Jedrzej Jagielski <jedrzej.jagielski@...el.com>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@...el.com>
Reviewed-by: Paul Menzel <pmenzel@...gen.mpg.de>
---
 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 6218bdb7f941..86b9caece104 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -12091,7 +12091,6 @@ 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);
@@ -12127,6 +12126,8 @@ static void ixgbe_remove(struct pci_dev *pdev)

 	if (disable_dev)
 		pci_disable_device(pdev);
+
+	devlink_free(adapter->devlink);
 }

 /**

-- 
2.51.0.rc1.197.g6d975e95c9d7