Description
In the Linux kernel, the following vulnerability has been resolved:
wifi: rt2x00: Fix memory leak when handling surveys
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:
[] __kmalloc+0x4b/0x130
[] rt2800_probe_hw+0xc2b/0x1380 [rt2800lib]
[] rt2800usb_probe_hw+0xe/0x60 [rt2800usb]
[] rt2x00lib_probe_dev+0x21a/0x7d0 [rt2x00lib]
[] rt2x00usb_probe+0x1be/0x980 [rt2x00usb]
[] usb_probe_interface+0xe2/0x310 [usbcore]
[] really_probe+0x1a5/0x410
[] __driver_probe_device+0x78/0x180
[] driver_probe_device+0x1e/0x90
[] __driver_attach+0xd2/0x1c0
[] bus_for_each_dev+0x77/0xd0
[] bus_add_driver+0x112/0x210
[] driver_register+0x5c/0x120
[] usb_register_driver+0x88/0x150 [usbcore]
[] do_one_initcall+0x44/0x220
[] do_init_module+0x4c/0x220
Fix this by freeing the channel surveys on device removal.
Tested with a RT3070 based USB wireless adapter.