概要

In the Linux kernel, the following vulnerability has been resolved:cifs: fix double free race when mount fails in cifs_get_root()When cifs_get_root() fails during cifs_smb3_do_mount() we calldeactivate_locked_super() which eventually will call delayed_free() whichwill free the context.In this situation we should not proceed to enter the out: section incifs_smb3_do_mount() and free the same resources a second time.[Thu Feb 10 12:59:06 2022] BUG: KASAN: use-after-free in rcu_cblist_dequeue+0x32/0x60[Thu Feb 10 12:59:06 2022] Read of size 8 at addr ffff888364f4d110 by task swapper/1/0[Thu Feb 10 12:59:06 2022] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G OE 5.17.0-rc3+ #4[Thu Feb 10 12:59:06 2022] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.0 12/17/2019[Thu Feb 10 12:59:06 2022] Call Trace:[Thu Feb 10 12:59:06 2022] <IRQ&gt;[Thu Feb 10 12:59:06 2022] dump_stack_lvl+0x5d/0x78[Thu Feb 10 12:59:06 2022] print_address_description.constprop.0+0x24/0x150[Thu Feb 10 12:59:06 2022] ? rcu_cblist_dequeue+0x32/0x60[Thu Feb 10 12:59:06 2022] kasan_report.cold+0x7d/0x117[Thu Feb 10 12:59:06 2022] ? rcu_cblist_dequeue+0x32/0x60[Thu Feb 10 12:59:06 2022] __asan_load8+0x86/0xa0[Thu Feb 10 12:59:06 2022] rcu_cblist_dequeue+0x32/0x60[Thu Feb 10 12:59:06 2022] rcu_core+0x547/0xca0[Thu Feb 10 12:59:06 2022] ? call_rcu+0x3c0/0x3c0[Thu Feb 10 12:59:06 2022] ? __this_cpu_preempt_check+0x13/0x20[Thu Feb 10 12:59:06 2022] ? lock_is_held_type+0xea/0x140[Thu Feb 10 12:59:06 2022] rcu_core_si+0xe/0x10[Thu Feb 10 12:59:06 2022] __do_softirq+0x1d4/0x67b[Thu Feb 10 12:59:06 2022] __irq_exit_rcu+0x100/0x150[Thu Feb 10 12:59:06 2022] irq_exit_rcu+0xe/0x30[Thu Feb 10 12:59:06 2022] sysvec_hyperv_stimer0+0x9d/0xc0...[Thu Feb 10 12:59:07 2022] Freed by task 58179:[Thu Feb 10 12:59:07 2022] kasan_save_stack+0x26/0x50[Thu Feb 10 12:59:07 2022] kasan_set_track+0x25/0x30[Thu Feb 10 12:59:07 2022] kasan_set_free_info+0x24/0x40[Thu Feb 10 12:59:07 2022] ____kasan_slab_free+0x137/0x170[Thu Feb 10 12:59:07 2022] __kasan_slab_free+0x12/0x20[Thu Feb 10 12:59:07 2022] slab_free_freelist_hook+0xb3/0x1d0[Thu Feb 10 12:59:07 2022] kfree+0xcd/0x520[Thu Feb 10 12:59:07 2022] cifs_smb3_do_mount+0x149/0xbe0 [cifs][Thu Feb 10 12:59:07 2022] smb3_get_tree+0x1a0/0x2e0 [cifs][Thu Feb 10 12:59:07 2022] vfs_get_tree+0x52/0x140[Thu Feb 10 12:59:07 2022] path_mount+0x635/0x10c0[Thu Feb 10 12:59:07 2022] __x64_sys_mount+0x1bf/0x210[Thu Feb 10 12:59:07 2022] do_syscall_64+0x5c/0xc0[Thu Feb 10 12:59:07 2022] entry_SYSCALL_64_after_hwframe+0x44/0xae[Thu Feb 10 12:59:07 2022] Last potentially related work creation:[Thu Feb 10 12:59:07 2022] kasan_save_stack+0x26/0x50[Thu Feb 10 12:59:07 2022] __kasan_record_aux_stack+0xb6/0xc0[Thu Feb 10 12:59:07 2022] kasan_record_aux_stack_noalloc+0xb/0x10[Thu Feb 10 12:59:07 2022] call_rcu+0x76/0x3c0[Thu Feb 10 12:59:07 2022] cifs_umount+0xce/0xe0 [cifs][Thu Feb 10 12:59:07 2022] cifs_kill_sb+0xc8/0xe0 [cifs][Thu Feb 10 12:59:07 2022] deactivate_locked_super+0x5d/0xd0[Thu Feb 10 12:59:07 2022] cifs_smb3_do_mount+0xab9/0xbe0 [cifs][Thu Feb 10 12:59:07 2022] smb3_get_tree+0x1a0/0x2e0 [cifs][Thu Feb 10 12:59:07 2022] vfs_get_tree+0x52/0x140[Thu Feb 10 12:59:07 2022] path_mount+0x635/0x10c0[Thu Feb 10 12:59:07 2022] __x64_sys_mount+0x1bf/0x210[Thu Feb 10 12:59:07 2022] do_syscall_64+0x5c/0xc0[Thu Feb 10 12:59:07 2022] entry_SYSCALL_64_after_hwframe+0x44/0xae

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