smb: client: fix potential UAF in cifs_signal_cifsd_for_reconnect()
commit e0e50401 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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