ice: Fix PTP NULL pointer dereference during VSI rebuild

Fix race condition where PTP periodic work runs while VSI is being
rebuilt, accessing NULL vsi->rx_rings.

The sequence was:
1. ice_ptp_prepare_for_reset() cancels PTP work
2. ice_ptp_rebuild() immediately queues PTP work
3. VSI rebuild happens AFTER ice_ptp_rebuild()
4. PTP work runs and accesses NULL vsi->rx_rings

Fix: Keep PTP work cancelled during rebuild, only queue it after
VSI rebuild completes in ice_rebuild().

Added ice_ptp_queue_work() helper function to encapsulate the logic
for queuing PTP work, ensuring it's only queued when PTP is supported
and the state is ICE_PTP_READY.

Error log:
[  121.392544] ice 0000:60:00.1: PTP reset successful
[  121.392692] BUG: kernel NULL pointer dereference, address: 0000000000000000
[  121.392712] #PF: supervisor read access in kernel mode
[  121.392720] #PF: error_code(0x0000) - not-present page
[  121.392727] PGD 0
[  121.392734] Oops: Oops: 0000 [#1] SMP NOPTI
[  121.392746] CPU: 8 UID: 0 PID: 1005 Comm: ice-ptp-0000:60 Tainted: G S                  6.19.0-rc6+ #4 PREEMPT(voluntary)
[  121.392761] Tainted: [S]=CPU_OUT_OF_SPEC
[  121.392773] RIP: 0010:ice_ptp_update_cached_phctime+0xbf/0x150 [ice]
[  121.393042] Call Trace:
[  121.393047]  <TASK>
[  121.393055]  ice_ptp_periodic_work+0x69/0x180 [ice]
[  121.393202]  kthread_worker_fn+0xa2/0x260
[  121.393216]  ? __pfx_ice_ptp_periodic_work+0x10/0x10 [ice]
[  121.393359]  ? __pfx_kthread_worker_fn+0x10/0x10
[  121.393371]  kthread+0x10d/0x230
[  121.393382]  ? __pfx_kthread+0x10/0x10
[  121.393393]  ret_from_fork+0x273/0x2b0
[  121.393407]  ? __pfx_kthread+0x10/0x10
[  121.393417]  ret_from_fork_asm+0x1a/0x30
[  121.393432]  </TASK>

Fixes: 803bef817807d ("ice: factor out ice_ptp_rebuild_owner()")
Signed-off-by: Aaron Ma <aaron.ma@canonical.com>
Tested-by: Sunitha Mekala <sunithax.d.mekala@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index 25cbbe67d9921258380ee62bc9b78e9003b5a33d..c1033070d0c7a78889847a38a09b77d14b26f897 100644 (file)
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -7809,6 +7809,9 @@ static void ice_rebuild(struct ice_pf *pf, enum ice_reset_req reset_type)
 
        /* Restore timestamp mode settings after VSI rebuild */
        ice_ptp_restore_timestamp_mode(pf);
+
+       /* Start PTP periodic work after VSI is fully rebuilt */
+       ice_ptp_queue_work(pf);
        return;
 
 err_vsi_rebuild:

diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c
index b5cef6396319f253ec7b5a007125874786aff944..2726830014762540201a10c58b9e91589fca09e4 100644 (file)
--- a/drivers/net/ethernet/intel/ice/ice_ptp.c
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.c
@@ -2839,6 +2839,20 @@ static void ice_ptp_periodic_work(struct kthread_work *work)
                                   msecs_to_jiffies(err ? 10 : 500));
 }
 
+/**
+ * ice_ptp_queue_work - Queue PTP periodic work for a PF
+ * @pf: Board private structure
+ *
+ * Helper function to queue PTP periodic work after VSI rebuild completes.
+ * This ensures that PTP work only runs when VSI structures are ready.
+ */
+void ice_ptp_queue_work(struct ice_pf *pf)
+{
+       if (test_bit(ICE_FLAG_PTP_SUPPORTED, pf->flags) &&
+           pf->ptp.state == ICE_PTP_READY)
+               kthread_queue_delayed_work(pf->ptp.kworker, &pf->ptp.work, 0);
+}
+
 /**
  * ice_ptp_prepare_rebuild_sec - Prepare second NAC for PTP reset or rebuild
  * @pf: Board private structure
@@ -2857,10 +2871,15 @@ static void ice_ptp_prepare_rebuild_sec(struct ice_pf *pf, bool rebuild,
                struct ice_pf *peer_pf = ptp_port_to_pf(port);
 
                if (!ice_is_primary(&peer_pf->hw)) {
-                       if (rebuild)
+                       if (rebuild) {
+                               /* TODO: When implementing rebuild=true:
+                                * 1. Ensure secondary PFs' VSIs are rebuilt
+                                * 2. Call ice_ptp_queue_work(peer_pf) after VSI rebuild
+                                */
                                ice_ptp_rebuild(peer_pf, reset_type);
-                       else
+                       } else {
                                ice_ptp_prepare_for_reset(peer_pf, reset_type);
+                       }
                }
        }
 }
@@ -3006,9 +3025,6 @@ void ice_ptp_rebuild(struct ice_pf *pf, enum ice_reset_req reset_type)
 
        ptp->state = ICE_PTP_READY;
 
-       /* Start periodic work going */
-       kthread_queue_delayed_work(ptp->kworker, &ptp->work, 0);
-
        dev_info(ice_pf_to_dev(pf), "PTP reset successful\n");
        return;
 

diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.h b/drivers/net/ethernet/intel/ice/ice_ptp.h
index 8489bd842710d64c8ad3d3feff74e63a208e6a45..8c44bd758a4fe36e3d9c41d2decdae7fc45ee6da 100644 (file)
--- a/drivers/net/ethernet/intel/ice/ice_ptp.h
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.h
@@ -318,6 +318,7 @@ void ice_ptp_prepare_for_reset(struct ice_pf *pf,
 void ice_ptp_init(struct ice_pf *pf);
 void ice_ptp_release(struct ice_pf *pf);
 void ice_ptp_link_change(struct ice_pf *pf, bool linkup);
+void ice_ptp_queue_work(struct ice_pf *pf);
 #else /* IS_ENABLED(CONFIG_PTP_1588_CLOCK) */
 
 static inline int ice_ptp_hwtstamp_get(struct net_device *netdev,
@@ -386,6 +387,10 @@ static inline void ice_ptp_link_change(struct ice_pf *pf, bool linkup)
 {
 }
 
+static inline void ice_ptp_queue_work(struct ice_pf *pf)
+{
+}
+
 static inline int ice_ptp_clock_index(struct ice_pf *pf)
 {
        return -1;