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    • Armin Wolf's avatar
      wifi: rt2x00: Fix memory leak when handling surveys · cbef9a83
      Armin Wolf authored
      When removing a rt2x00 device, its associated channel surveys
      are not freed, causing a memory leak observable with kmemleak:
      
      unreferenced object 0xffff9620f0881a00 (size 512):
        comm "systemd-udevd", pid 2290, jiffies 4294906974 (age 33.768s)
        hex dump (first 32 bytes):
          70 44 12 00 00 00 00 00 92 8a 00 00 00 00 00 00  pD..............
          00 00 00 00 00 00 00 00 ab 87 01 00 00 00 00 00  ................
        backtrace:
          [<ffffffffb0ed858b>] __kmalloc+0x4b/0x130
          [<ffffffffc1b0f29b>] rt2800_probe_hw+0xc2b/0x1380 [rt2800lib]
          [<ffffffffc1a9496e>] rt2800usb_probe_hw+0xe/0x60 [rt2800usb]
          [<ffffffffc1ae491a>] rt2x00lib_probe_dev+0x21a/0x7d0 [rt2x00lib]
          [<ffffffffc1b3b83e>] rt2x00usb_probe+0x1be/0x980 [rt2x00usb]
          [<ffffffffc05981e2>] usb_probe_interface+0xe2/0x310 [usbcore]
          [<ffffffffb13be2d5>] really_probe+0x1a5/0x410
          [<ffffffffb13be5c8>] __driver_probe_device+0x78/0x180
          [<ffffffffb13be6fe>] driver_probe_device+0x1e/0x90
          [<ffffffffb13be972>] __driver_attach+0xd2/0x1c0
          [<ffffffffb13bbc57>] bus_for_each_dev+0x77/0xd0
          [<ffffffffb13bd2a2>] bus_add_driver+0x112/0x210
          [<ffffffffb13bfc6c>] driver_register+0x5c/0x120
          [<ffffffffc0596ae8>] usb_register_driver+0x88/0x150 [usbcore]
          [<ffffffffb0c011c4>] do_one_initcall+0x44/0x220
          [<ffffffffb0d6134c>] do_init_module+0x4c/0x220
      
      Fix this by freeing the channel surveys on device removal.
      
      Tested with a RT3070 based USB wireless adapter.
      
      Fixes: 54476269 ("rt2x00: save survey for every channel visited")
      Signed-off-by: default avatarArmin Wolf <W_Armin@gmx.de>
      Reviewed-by: default avatarSimon Horman <simon.horman@corigine.com>
      Acked-by: default avatarStanislaw Gruszka <stf_xl@wp.pl>
      Signed-off-by: default avatarKalle Valo <kvalo@kernel.org>
      Link: https://lore.kernel.org/r/20230330215637.4332-1-W_Armin@gmx.de
      cbef9a83