CVE-2023-52752

In the Linux kernel, the following vulnerability has been resolved: smb:
client: fix use-after-free bug in cifs_debug_data_proc_show() Skip SMB
sessions that are being teared down (e.g. @ses->ses_status == SES_EXITING)
in cifs_debug_data_proc_show() to avoid use-after-free in @ses. This fixes
the following GPF when reading from /proc/fs/cifs/DebugData while mounting
and umounting [ 816.251274] general protection fault, probably for
non-canonical address 0x6b6b6b6b6b6b6d81: 0000 [#1] PREEMPT SMP NOPTI … [
816.260138] Call Trace: [ 816.260329] <TASK> [ 816.260499] ?
die_addr+0x36/0x90 [ 816.260762] ? exc_general_protection+0x1b3/0x410 [
816.261126] ? asm_exc_general_protection+0x26/0x30 [ 816.261502] ?
cifs_debug_tcon+0xbd/0x240 [cifs] [ 816.261878] ?
cifs_debug_tcon+0xab/0x240 [cifs] [ 816.262249]
cifs_debug_data_proc_show+0x516/0xdb0 [cifs] [ 816.262689] ?
seq_read_iter+0x379/0x470 [ 816.262995] seq_read_iter+0x118/0x470 [
816.263291] proc_reg_read_iter+0x53/0x90 [ 816.263596] ?
srso_alias_return_thunk+0x5/0x7f [ 816.263945] vfs_read+0x201/0x350 [
816.264211] ksys_read+0x75/0x100 [ 816.264472] do_syscall_64+0x3f/0x90 [
816.264750] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 816.265135] RIP:
0033:0x7fd5e669d381