1. 29 Nov, 2022 14 commits
  2. 28 Nov, 2022 12 commits
  3. 27 Nov, 2022 1 commit
    • Yang Yingliang's avatar
      net: phy: fix null-ptr-deref while probe() failed · 369eb2c9
      Yang Yingliang authored
      I got a null-ptr-deref report as following when doing fault injection test:
      
      BUG: kernel NULL pointer dereference, address: 0000000000000058
      Oops: 0000 [#1] PREEMPT SMP KASAN PTI
      CPU: 1 PID: 253 Comm: 507-spi-dm9051 Tainted: G    B            N 6.1.0-rc3+
      Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014
      RIP: 0010:klist_put+0x2d/0xd0
      Call Trace:
       <TASK>
       klist_remove+0xf1/0x1c0
       device_release_driver_internal+0x23e/0x2d0
       bus_remove_device+0x1bd/0x240
       device_del+0x357/0x770
       phy_device_remove+0x11/0x30
       mdiobus_unregister+0xa5/0x140
       release_nodes+0x6a/0xa0
       devres_release_all+0xf8/0x150
       device_unbind_cleanup+0x19/0xd0
      
      //probe path:
      phy_device_register()
        device_add()
      
      phy_connect
        phy_attach_direct() //set device driver
          probe() //it's failed, driver is not bound
          device_bind_driver() // probe failed, it's not called
      
      //remove path:
      phy_device_remove()
        device_del()
          device_release_driver_internal()
            __device_release_driver() //dev->drv is not NULL
              klist_remove() <- knode_driver is not added yet, cause null-ptr-deref
      
      In phy_attach_direct(), after setting the 'dev->driver', probe() fails,
      device_bind_driver() is not called, so the knode_driver->n_klist is not
      set, then it causes null-ptr-deref in __device_release_driver() while
      deleting device. Fix this by setting dev->driver to NULL in the error
      path in phy_attach_direct().
      
      Fixes: e1393456 ("[PATCH] PHY Layer fixup")
      Signed-off-by: default avatarYang Yingliang <yangyingliang@huawei.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      369eb2c9
  4. 25 Nov, 2022 11 commits
  5. 24 Nov, 2022 2 commits