CVE-2023-53427

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> cifs: Fix warning and UAF when destroy the MR list<br /> <br /> If the MR allocate failed, the MR recovery work not initialized<br /> and list not cleared. Then will be warning and UAF when release<br /> the MR:<br /> <br /> WARNING: CPU: 4 PID: 824 at kernel/workqueue.c:3066 __flush_work.isra.0+0xf7/0x110<br /> CPU: 4 PID: 824 Comm: mount.cifs Not tainted 6.1.0-rc5+ #82<br /> RIP: 0010:__flush_work.isra.0+0xf7/0x110<br /> Call Trace:<br /> <br /> __cancel_work_timer+0x2ba/0x2e0<br /> smbd_destroy+0x4e1/0x990<br /> _smbd_get_connection+0x1cbd/0x2110<br /> smbd_get_connection+0x21/0x40<br /> cifs_get_tcp_session+0x8ef/0xda0<br /> mount_get_conns+0x60/0x750<br /> cifs_mount+0x103/0xd00<br /> cifs_smb3_do_mount+0x1dd/0xcb0<br /> smb3_get_tree+0x1d5/0x300<br /> vfs_get_tree+0x41/0xf0<br /> path_mount+0x9b3/0xdd0<br /> __x64_sys_mount+0x190/0x1d0<br /> do_syscall_64+0x35/0x80<br /> entry_SYSCALL_64_after_hwframe+0x46/0xb0<br /> <br /> BUG: KASAN: use-after-free in smbd_destroy+0x4fc/0x990<br /> Read of size 8 at addr ffff88810b156a08 by task mount.cifs/824<br /> CPU: 4 PID: 824 Comm: mount.cifs Tainted: G W 6.1.0-rc5+ #82<br /> Call Trace:<br /> dump_stack_lvl+0x34/0x44<br /> print_report+0x171/0x472<br /> kasan_report+0xad/0x130<br /> smbd_destroy+0x4fc/0x990<br /> _smbd_get_connection+0x1cbd/0x2110<br /> smbd_get_connection+0x21/0x40<br /> cifs_get_tcp_session+0x8ef/0xda0<br /> mount_get_conns+0x60/0x750<br /> cifs_mount+0x103/0xd00<br /> cifs_smb3_do_mount+0x1dd/0xcb0<br /> smb3_get_tree+0x1d5/0x300<br /> vfs_get_tree+0x41/0xf0<br /> path_mount+0x9b3/0xdd0<br /> __x64_sys_mount+0x190/0x1d0<br /> do_syscall_64+0x35/0x80<br /> entry_SYSCALL_64_after_hwframe+0x46/0xb0<br /> <br /> Allocated by task 824:<br /> kasan_save_stack+0x1e/0x40<br /> kasan_set_track+0x21/0x30<br /> __kasan_kmalloc+0x7a/0x90<br /> _smbd_get_connection+0x1b6f/0x2110<br /> smbd_get_connection+0x21/0x40<br /> cifs_get_tcp_session+0x8ef/0xda0<br /> mount_get_conns+0x60/0x750<br /> cifs_mount+0x103/0xd00<br /> cifs_smb3_do_mount+0x1dd/0xcb0<br /> smb3_get_tree+0x1d5/0x300<br /> vfs_get_tree+0x41/0xf0<br /> path_mount+0x9b3/0xdd0<br /> __x64_sys_mount+0x190/0x1d0<br /> do_syscall_64+0x35/0x80<br /> entry_SYSCALL_64_after_hwframe+0x46/0xb0<br /> <br /> Freed by task 824:<br /> kasan_save_stack+0x1e/0x40<br /> kasan_set_track+0x21/0x30<br /> kasan_save_free_info+0x2a/0x40<br /> ____kasan_slab_free+0x143/0x1b0<br /> __kmem_cache_free+0xc8/0x330<br /> _smbd_get_connection+0x1c6a/0x2110<br /> smbd_get_connection+0x21/0x40<br /> cifs_get_tcp_session+0x8ef/0xda0<br /> mount_get_conns+0x60/0x750<br /> cifs_mount+0x103/0xd00<br /> cifs_smb3_do_mount+0x1dd/0xcb0<br /> smb3_get_tree+0x1d5/0x300<br /> vfs_get_tree+0x41/0xf0<br /> path_mount+0x9b3/0xdd0<br /> __x64_sys_mount+0x190/0x1d0<br /> do_syscall_64+0x35/0x80<br /> entry_SYSCALL_64_after_hwframe+0x46/0xb0<br /> <br /> Let&amp;#39;s initialize the MR recovery work before MR allocate to prevent<br /> the warning, remove the MRs from the list to prevent the UAF.