6.12-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jacob Keller jacob.e.keller@intel.com
[ Upstream commit f6486338fde3f04ed0ec59fe67a69a208c32734f ]
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: 82e71b226e0e ("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: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/intel/ice/ice_main.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-)
diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c index 74d4f2fde3e0f..bd5db525f1939 100644 --- a/drivers/net/ethernet/intel/ice/ice_main.c +++ b/drivers/net/ethernet/intel/ice/ice_main.c @@ -3193,12 +3193,14 @@ 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 |