CVE-2024-53183

In the Linux kernel, the following vulnerability has been resolved:

um: net: Do not use drvdata in release

The drvdata is not available in release. Let's just use containerof() to get the umlnet instance. Otherwise, removing a network device will result in a crash:

RIP: 0033:netdevicerelease+0x10/0x6f RSP: 00000000e20c7c40 EFLAGS: 00010206 RAX: 000000006002e4e7 RBX: 00000000600f1baf RCX: 00000000624074e0 RDX: 0000000062778000 RSI: 0000000060551c80 RDI: 00000000627af028 RBP: 00000000e20c7c50 R08: 00000000603ad594 R09: 00000000e20c7b70 R10: 000000000000135a R11: 00000000603ad422 R12: 0000000000000000 R13: 0000000062c7af00 R14: 0000000062406d60 R15: 00000000627700b6 Kernel panic - not syncing: Segfault with no mm CPU: 0 UID: 0 PID: 29 Comm: kworker/0:2 Not tainted 6.12.0-rc6-g59b723cd2adb #1 Workqueue: events mcworkproc Stack: 627af028 62c7af00 e20c7c80 60276fcd 62778000 603f5820 627af028 00000000 e20c7cb0 603a2bcd 627af000 62770010 Call Trace: [<60276fcd>] devicerelease+0x70/0xba [<603a2bcd>] kobjectput+0xba/0xe7 [<60277265>] putdevice+0x19/0x1c [<60281266>] platformdeviceput+0x26/0x29 [<60281e5f>] platformdeviceunregister+0x2c/0x2e [<6002ec9c>] netremove+0x63/0x69 [<60031316>] ? mconsolereply+0x0/0x50 [<600310c8>] mconsoleremove+0x160/0x1cc [<60087d40>] ? _removehrtimer+0x38/0x74 [<60087ff8>] ? hrtimertrytocancel+0x8c/0x98 [<6006b3cf>] ? dlserverstop+0x3f/0x48 [<6006b390>] ? dlserverstop+0x0/0x48 [<600672e8>] ? dequeueentities+0x327/0x390 [<60038fa6>] ? umsetsignals+0x0/0x43 [<6003070c>] mcworkproc+0x77/0x91 [<60057664>] processscheduledworks+0x1b3/0x2dd [<60055f32>] ? assignwork+0x0/0x58 [<60057f0a>] workerthread+0x1e9/0x293 [<6005406f>] ? setpfworker+0x0/0x64 [<6005d65d>] ? archlocalirqsave+0x0/0x2d [<6005d748>] ? kthreadexit+0x0/0x3a [<60057d21>] ? workerthread+0x0/0x293 [<6005dbf1>] kthread+0x126/0x12b [<600219c5>] newthread_handler+0x85/0xb6