CVE-2024-53184

In the Linux kernel, the following vulnerability has been resolved: um: ubd: Do not use drvdata in release The drvdata is not available in release. Let's just use container_of() to get the ubd instance. Otherwise, removing a ubd device will result in a crash: RIP: 0033:blk_mq_free_tag_set+0x1f/0xba RSP: 00000000e2083bf0 EFLAGS: 00010246 RAX: 000000006021463a RBX: 0000000000000348 RCX: 0000000062604d00 RDX: 0000000004208060 RSI: 00000000605241a0 RDI: 0000000000000348 RBP: 00000000e2083c10 R08: 0000000062414010 R09: 00000000601603f7 R10: 000000000000133a R11: 000000006038c4bd R12: 0000000000000000 R13: 0000000060213a5c R14: 0000000062405d20 R15: 00000000604f7aa0 Kernel panic - not syncing: Segfault with no mm CPU: 0 PID: 17 Comm: kworker/0:1 Not tainted 6.8.0-rc3-00107-gba3f67c11638 #1 Workqueue: events mc_work_proc Stack: 00000000 604f7ef0 62c5d000 62405d20 e2083c30 6002c776 6002c755 600e47ff e2083c60 6025ffe3 04208060 603d36e0 Call Trace: [ ] ubd_device_release+0x21/0x55 [ ] ? ubd_device_release+0x0/0x55 [ ] ? kfree+0x0/0x100 [ ] device_release+0x70/0xba [ ] kobject_put+0xb5/0xe2 [ ] put_device+0x19/0x1c [ ] platform_device_put+0x26/0x29 [ ] platform_device_unregister+0x2c/0x2e [ ] ubd_remove+0xb8/0xd6 [ ] ? mconsole_reply+0x0/0x50 [ ] mconsole_remove+0x160/0x1cc [ ] ? mconsole_reply+0x48/0x50 [ ] ? um_set_signals+0x3b/0x43 [ ] ? update_min_vruntime+0x14/0x70 [ ] ? dequeue_task_fair+0x164/0x235 [ ] ? update_cfs_group+0x0/0x40 [ ] ? __schedule+0x0/0x3ed [ ] ? um_set_signals+0x0/0x43 [ ] mc_work_proc+0x77/0x91 [ ] process_scheduled_works+0x1af/0x2c3 [ ] ? assign_work+0x0/0x58 [ ] worker_thread+0x2f7/0x37a [ ] ? set_pf_worker+0x0/0x64 [ ] ? arch_local_irq_save+0x0/0x2d [ ] ? kthread_exit+0x0/0x3a [ ] ? worker_thread+0x0/0x37a [ ] kthread+0x130/0x135 [ ] new_thread_handler+0x85/0xb6