smb: client: fix potential UAF in cifs_signal_cifsd_for_reconnect()
commit e0e50401cc
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>
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@ -216,6 +216,8 @@ cifs_signal_cifsd_for_reconnect(struct TCP_Server_Info *server,
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spin_lock(&cifs_tcp_ses_lock);
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list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
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if (cifs_ses_exiting(ses))
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continue;
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spin_lock(&ses->chan_lock);
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for (i = 0; i < ses->chan_count; i++) {
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spin_lock(&ses->chans[i].server->srv_lock);
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