linux-kernel - [PATCH v3] ice: ice_adapter: release xa entry on adapter allocation failure

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Message-ID: <20251001115336.1707-1-vulab@iscas.ac.cn>
Date: Wed,  1 Oct 2025 19:53:36 +0800
From: Haotian Zhang <vulab@...as.ac.cn>
To: Jacob Keller <jacob.e.keller@...el.com>,
	Tony Nguyen <anthony.l.nguyen@...el.com>,
	Przemek Kitszel <przemyslaw.kitszel@...el.com>
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	intel-wired-lan@...ts.osuosl.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Haotian Zhang <vulab@...as.ac.cn>
Subject: [PATCH v3] ice: ice_adapter: release xa entry on adapter allocation failure

When ice_adapter_new() fails, the reserved XArray entry created by
xa_insert() is not released. This causes subsequent insertions at
the same index to return -EBUSY, potentially leading to
NULL pointer dereferences.

Reorder the operations as suggested by Przemek Kitszel:
1. Check if adapter already exists (xa_load)
2. Reserve the XArray slot (xa_reserve)
3. Allocate the adapter (ice_adapter_new)
4. Store the adapter (xa_store)

Fixes: 0f0023c649c7 ("ice: do not init struct ice_adapter more times than needed")
Suggested-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>
Suggested-by: Jacob Keller <jacob.e.keller@...el.com>
Signed-off-by: Haotian Zhang <vulab@...as.ac.cn>

---
Changes in v3:
  - Reorder xa_load/xa_reserve/ice_adapter_new/xa_store calls as
    suggested by Przemek Kitszel, instead of just adding xa_release().
Changes in v2:
  - Instead of checking the return value of xa_store(), fix the real bug
    where a failed ice_adapter_new() would leave a stale entry in the
    XArray.
  - Use xa_release() to clean up the reserved entry, as suggested by
    Jacob Keller.
---
 drivers/net/ethernet/intel/ice/ice_adapter.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_adapter.c b/drivers/net/ethernet/intel/ice/ice_adapter.c
index b53561c34708..0a8a48cd4bce 100644
--- a/drivers/net/ethernet/intel/ice/ice_adapter.c
+++ b/drivers/net/ethernet/intel/ice/ice_adapter.c
@@ -99,19 +99,21 @@ struct ice_adapter *ice_adapter_get(struct pci_dev *pdev)
 
 	index = ice_adapter_xa_index(pdev);
 	scoped_guard(mutex, &ice_adapters_mutex) {
-		err = xa_insert(&ice_adapters, index, NULL, GFP_KERNEL);
-		if (err == -EBUSY) {
-			adapter = xa_load(&ice_adapters, index);
+		adapter = xa_load(&ice_adapters, index);
+		if (adapter) {
 			refcount_inc(&adapter->refcount);
 			WARN_ON_ONCE(adapter->index != ice_adapter_index(pdev));
 			return adapter;
 		}
+		err = xa_reserve(&ice_adapters, index, GFP_KERNEL);
 		if (err)
 			return ERR_PTR(err);
 
 		adapter = ice_adapter_new(pdev);
-		if (!adapter)
+		if (!adapter) {
+			xa_release(&ice_adapters, index);
 			return ERR_PTR(-ENOMEM);
+		}
 		xa_store(&ice_adapters, index, adapter, GFP_KERNEL);
 	}
 	return adapter;
-- 
2.50.1.windows.1