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smb: client: fix potential UAF in is_valid_oplock_break() 

commit 69ccf040acddf33a3a85ec0f6b45ef84b0f7ec29 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 16:34:00 -03:00 committed by Greg Kroah-Hartman
parent f92739fdd4
commit 0a15ba88a3
1 changed files with 2 additions and 0 deletions
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2
fs/smb/client/misc.c
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@ -489,6 +489,8 @@ is_valid_oplock_break(char *buffer, struct TCP_Server_Info *srv)
/* look up tcon based on tid & uid */
spin_lock(&cifs_tcp_ses_lock);
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) {
if (tcon->tid != buf->Tid)
continue;