ice: fix NULL access of tx->in_use in ice_ll_ts_intr

JIRA: https://issues.redhat.com/browse/RHEL-84608

Upstream commit(s):
commit f648633
Author: Jacob Keller <jacob.e.keller@intel.com>
Date:   Thu Aug 7 10:35:27 2025 -0700

    ice: fix NULL access of tx->in_use in ice_ll_ts_intr

    Recent versions of the E810 firmware have support for an extra interrupt to
    handle report of the "low latency" Tx timestamps coming from the
    specialized low latency firmware interface. Instead of polling the
    registers, software can wait until the low latency interrupt is fired.

    This logic makes use of the Tx timestamp tracking structure, ice_ptp_tx, as
    it uses the same "ready" bitmap to track which Tx timestamps complete.

    Unfortunately, the ice_ll_ts_intr() function does not check if the
    tracker is initialized before its first access. This results in NULL
    dereference or use-after-free bugs similar to the issues fixed in the
    ice_ptp_ts_irq() function.

    Fix this by only checking the in_use bitmap (and other fields) if the
    tracker is marked as initialized. The reset flow will clear the init field
    under lock before it tears the tracker down, thus preventing any
    use-after-free or NULL access.

    Fixes: 82e71b2 ("ice: Enable SW interrupt from FW for LL TS")
    Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
    Reviewed-by: Paul Menzel <pmenzel@molgen.mpg.de>
    Tested-by: Rinitha S <sx.rinitha@intel.com> (A Contingent worker at Intel)
    Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

Signed-off-by: Petr Oros <poros@redhat.com>

Author: orosp

drivers/net/ethernet/intel/ice/ice_main.c

@@ -3230,12 +3230,14 @@ static irqreturn_t ice_ll_ts_intr(int __always_unused irq, void *data)
 	hw = &pf->hw;
 	tx = &pf->ptp.port.tx;
 	spin_lock_irqsave(&tx->lock, flags);
-	ice_ptp_complete_tx_single_tstamp(tx);
+	if (tx->init) {
+		ice_ptp_complete_tx_single_tstamp(tx);
 
-	idx = find_next_bit_wrap(tx->in_use, tx->len,
-				 tx->last_ll_ts_idx_read + 1);
-	if (idx != tx->len)
-		ice_ptp_req_tx_single_tstamp(tx, idx);
+		idx = find_next_bit_wrap(tx->in_use, tx->len,
+					 tx->last_ll_ts_idx_read + 1);
+		if (idx != tx->len)
+			ice_ptp_req_tx_single_tstamp(tx, idx);
+	}
 	spin_unlock_irqrestore(&tx->lock, flags);
 
 	val = GLINT_DYN_CTL_INTENA_M | GLINT_DYN_CTL_CLEARPBA_M |