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[net,v2,2/2] be2net: Free/delete pmacs (in be_clear()) only if they exist

Message ID 4bd9f614-2820-41d9-9b49-aa9311482203@CMEXHTCAS2.ad.emulex.com
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

Somnath Kotur Dec. 5, 2013, 6:38 a.m. UTC 
During suspend-resume and lancer error recovery we will cleanup and
re-initialize the resources through be_clear() and be_setup() respectively.
During re-initialisation in be_setup(), if be_get_config() fails, we'll again
call be_clear() which will cause a NULL pointer dereference as adapter->pmac_id is
already freed.

Signed-off-by: Kalesh AP <kalesh.purayil@emulex.com>
Signed-off-by: Somnath Kotur <somnath.kotur@emulex.com>
---
 drivers/net/ethernet/emulex/benet/be_main.c |   23 +++++++++++++++--------
 1 files changed, 15 insertions(+), 8 deletions(-)
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Patch

diff --git a/drivers/net/ethernet/emulex/benet/be_main.c b/drivers/net/ethernet/emulex/benet/be_main.c
index a2302dc..0fde69d 100644
--- a/drivers/net/ethernet/emulex/benet/be_main.c
+++ b/drivers/net/ethernet/emulex/benet/be_main.c
@@ -2940,28 +2940,35 @@  static void be_cancel_worker(struct be_adapter *adapter)
 	}
 }
 
-static int be_clear(struct be_adapter *adapter)
+static void be_mac_clear(struct be_adapter *adapter)
 {
 	int i;
 
+	if (adapter->pmac_id) {
+		for (i = 0; i < (adapter->uc_macs + 1); i++)
+			be_cmd_pmac_del(adapter, adapter->if_handle,
+					adapter->pmac_id[i], 0);
+		adapter->uc_macs = 0;
+
+		kfree(adapter->pmac_id);
+		adapter->pmac_id = NULL;
+	}
+}
+
+static int be_clear(struct be_adapter *adapter)
+{
 	be_cancel_worker(adapter);
 
 	if (sriov_enabled(adapter))
 		be_vf_clear(adapter);
 
 	/* delete the primary mac along with the uc-mac list */
-	for (i = 0; i < (adapter->uc_macs + 1); i++)
-		be_cmd_pmac_del(adapter, adapter->if_handle,
-				adapter->pmac_id[i], 0);
-	adapter->uc_macs = 0;
+	be_mac_clear(adapter);
 
 	be_cmd_if_destroy(adapter, adapter->if_handle,  0);
 
 	be_clear_queues(adapter);
 
-	kfree(adapter->pmac_id);
-	adapter->pmac_id = NULL;
-
 	be_msix_disable(adapter);
 	return 0;
 }