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smb: client: fix potential UAF in smb2_is_valid_lease_break()

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commit 705c76fbf726c7a2f6ff9143d4013b18daaaebf1 upstream.

Skip sessions that are being teared down (status == SES_EXITING) to
avoid UAF.

Cc: stable@vger.kernel.org
Signed-off-by: Paulo Alcantara (Red Hat) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Paulo Alcantara
2024-04-02 16:33:58 -03:00
committed by Greg Kroah-Hartman
parent 84488466b7
commit c868cabdf6
1 changed files with 2 additions and 0 deletions
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2
fs/smb/client/smb2misc.c
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@@ -622,6 +622,8 @@ smb2_is_valid_lease_break(char *buffer, struct TCP_Server_Info *server)
/* look up tcon based on tid & uid */ /* look up tcon based on tid & uid */
spin_lock(&cifs_tcp_ses_lock); spin_lock(&cifs_tcp_ses_lock);
list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) { list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
if (cifs_ses_exiting(ses))
continue;
list_for_each_entry(tcon, &ses->tcon_list, tcon_list) { list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
spin_lock(&tcon->open_file_lock); spin_lock(&tcon->open_file_lock);
cifs_stats_inc( cifs_stats_inc(