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authorPaulo Alcantara <pc@manguebit.com>2023-10-24 19:49:15 +0300
committerSteve French <stfrench@microsoft.com>2023-10-31 20:38:26 +0300
commitd328c09ee9f15ee5a26431f5aad7c9239fa85e62 (patch)
treeb25a773c214714113c19ed133425edbb32bef63f /fs/smb/client/cifs_debug.c
parente6322fd177c6885a21dd4609dc5e5c973d1a2eb7 (diff)
downloadlinux-d328c09ee9f15ee5a26431f5aad7c9239fa85e62.tar.xz
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 Cc: stable@vger.kernel.org Signed-off-by: Paulo Alcantara (SUSE) <pc@manguebit.com> Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/smb/client/cifs_debug.c')
-rw-r--r--fs/smb/client/cifs_debug.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/smb/client/cifs_debug.c b/fs/smb/client/cifs_debug.c
index 76922fcc4bc6..9a0ccd87468e 100644
--- a/fs/smb/client/cifs_debug.c
+++ b/fs/smb/client/cifs_debug.c
@@ -452,6 +452,11 @@ skip_rdma:
seq_printf(m, "\n\n\tSessions: ");
i = 0;
list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
+ spin_lock(&ses->ses_lock);
+ if (ses->ses_status == SES_EXITING) {
+ spin_unlock(&ses->ses_lock);
+ continue;
+ }
i++;
if ((ses->serverDomain == NULL) ||
(ses->serverOS == NULL) ||
@@ -472,6 +477,7 @@ skip_rdma:
ses->ses_count, ses->serverOS, ses->serverNOS,
ses->capabilities, ses->ses_status);
}
+ spin_unlock(&ses->ses_lock);
seq_printf(m, "\n\tSecurity type: %s ",
get_security_type_str(server->ops->select_sectype(server, ses->sectype)));