releases/6.6.26/smb-client-fix-potential-uaf-in-smb2_is_network_name_deleted.patch

   1 From 63981561ffd2d4987807df4126f96a11e18b0c1d Mon Sep 17 00:00:00 2001
   2 From: Paulo Alcantara <pc@manguebit.com>
   3 Date: Tue, 2 Apr 2024 16:34:02 -0300
   4 Subject: smb: client: fix potential UAF in smb2_is_network_name_deleted()
   5
   6 From: Paulo Alcantara <pc@manguebit.com>
   7
   8 commit 63981561ffd2d4987807df4126f96a11e18b0c1d upstream.
   9
  10 Skip sessions that are being teared down (status == SES_EXITING) to
  11 avoid UAF.
  12
  13 Cc: stable@vger.kernel.org
  14 Signed-off-by: Paulo Alcantara (Red Hat) <pc@manguebit.com>
  15 Signed-off-by: Steve French <stfrench@microsoft.com>
  16 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  17 ---
  18  fs/smb/client/smb2ops.c |    2 ++
  19  1 file changed, 2 insertions(+)
  20
  21 --- a/fs/smb/client/smb2ops.c
  22 +++ b/fs/smb/client/smb2ops.c
  23 @@ -2430,6 +2430,8 @@ smb2_is_network_name_deleted(char *buf,
  24
  25         spin_lock(&cifs_tcp_ses_lock);
  26         list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
  27 +               if (cifs_ses_exiting(ses))
  28 +                       continue;
  29                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
  30                         if (tcon->tid == le32_to_cpu(shdr->Id.SyncId.TreeId)) {
  31                                 spin_lock(&tcon->tc_lock);