target/linux/generic/backport-5.15/778-v5.18-03-net-phy-at803x-fix-NULL-pointer-dereference-on-AR9331-PHY.patch

   1 From 9926de7315be3d606cc011a305ad9adb9e8e14c9 Mon Sep 17 00:00:00 2001
   2 From: Oleksij Rempel <o.rempel@pengutronix.de>
   3 Date: Sat, 18 Jun 2022 14:23:33 +0200
   4 Subject: [PATCH] net: phy: at803x: fix NULL pointer dereference on AR9331 PHY
   5
   6 Latest kernel will explode on the PHY interrupt config, since it depends
   7 now on allocated priv. So, run probe to allocate priv to fix it.
   8
   9  ar9331_switch ethernet.1:10 lan0 (uninitialized): PHY [!ahb!ethernet@1a000000!mdio!switch@10:00] driver [Qualcomm Atheros AR9331 built-in PHY] (irq=13)
  10  CPU 0 Unable to handle kernel paging request at virtual address 0000000a, epc == 8050e8a8, ra == 80504b34
  11          ...
  12  Call Trace:
  13  [<8050e8a8>] at803x_config_intr+0x5c/0xd0
  14  [<80504b34>] phy_request_interrupt+0xa8/0xd0
  15  [<8050289c>] phylink_bringup_phy+0x2d8/0x3ac
  16  [<80502b68>] phylink_fwnode_phy_connect+0x118/0x130
  17  [<8074d8ec>] dsa_slave_create+0x270/0x420
  18  [<80743b04>] dsa_port_setup+0x12c/0x148
  19  [<8074580c>] dsa_register_switch+0xaf0/0xcc0
  20  [<80511344>] ar9331_sw_probe+0x370/0x388
  21  [<8050cb78>] mdio_probe+0x44/0x70
  22  [<804df300>] really_probe+0x200/0x424
  23  [<804df7b4>] __driver_probe_device+0x290/0x298
  24  [<804df810>] driver_probe_device+0x54/0xe4
  25  [<804dfd50>] __device_attach_driver+0xe4/0x130
  26  [<804dcb00>] bus_for_each_drv+0xb4/0xd8
  27  [<804dfac4>] __device_attach+0x104/0x1a4
  28  [<804ddd24>] bus_probe_device+0x48/0xc4
  29  [<804deb44>] deferred_probe_work_func+0xf0/0x10c
  30  [<800a0ffc>] process_one_work+0x314/0x4d4
  31  [<800a17fc>] worker_thread+0x2a4/0x354
  32  [<800a9a54>] kthread+0x134/0x13c
  33  [<8006306c>] ret_from_kernel_thread+0x14/0x1c
  34
  35 Same Issue would affect some other PHYs (QCA8081, QCA9561), so fix it
  36 too.
  37
  38 Fixes: 3265f4218878 ("net: phy: at803x: add fiber support")
  39 Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
  40 Reviewed-by: Andrew Lunn <andrew@lunn.ch>
  41 Signed-off-by: David S. Miller <davem@davemloft.net>
  42 ---
  43  drivers/net/phy/at803x.c | 6 ++++++
  44  1 file changed, 6 insertions(+)
  45
  46 --- a/drivers/net/phy/at803x.c
  47 +++ b/drivers/net/phy/at803x.c
  48 @@ -1592,6 +1592,8 @@ static struct phy_driver at803x_driver[]
  49         /* ATHEROS AR9331 */
  50         PHY_ID_MATCH_EXACT(ATH9331_PHY_ID),
  51         .name                   = "Qualcomm Atheros AR9331 built-in PHY",
  52 +       .probe                  = at803x_probe,
  53 +       .remove                 = at803x_remove,
  54         .suspend                = at803x_suspend,
  55         .resume                 = at803x_resume,
  56         .flags                  = PHY_POLL_CABLE_TEST,