Bluetooth: Fix potential use-after-free when clear keys

Similar to commit c5d2b6fa26b5 ("Bluetooth: Fix use-after-free in hci_remove_ltk/hci_remove_irk"). We can not access k after kfree_rcu() call.

---
 net/bluetooth/hci_core.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

index a856b1051d35..bae8a9919dbe 100644
@@ -1074,9 +1074,9 @@ void hci_uuids_clear(struct hci_dev *hdev)
 
 void hci_link_keys_clear(struct hci_dev *hdev)
 {
-	struct link_key *key;
+	struct link_key *key, *tmp;
 
-	list_for_each_entry(key, &hdev->link_keys, list) {
+	list_for_each_entry_safe(key, tmp, &hdev->link_keys, list) {
 		list_del_rcu(&key->list);
 		kfree_rcu(key, rcu);
 	}

@@ -1084,9 +1084,9 @@ void hci_link_keys_clear(struct hci_dev *hdev)
 
 void hci_smp_ltks_clear(struct hci_dev *hdev)
 {
-	struct smp_ltk *k;
+	struct smp_ltk *k, *tmp;
 
-	list_for_each_entry(k, &hdev->long_term_keys, list) {
+	list_for_each_entry_safe(k, tmp, &hdev->long_term_keys, list) {
 		list_del_rcu(&k->list);
 		kfree_rcu(k, rcu);
 	}

@@ -1094,9 +1094,9 @@ void hci_smp_ltks_clear(struct hci_dev *hdev)
 
 void hci_smp_irks_clear(struct hci_dev *hdev)
 {
-	struct smp_irk *k;
+	struct smp_irk *k, *tmp;
 
-	list_for_each_entry(k, &hdev->identity_resolving_keys, list) {
+	list_for_each_entry_safe(k, tmp, &hdev->identity_resolving_keys, list) {
 		list_del_rcu(&k->list);
 		kfree_rcu(k, rcu);
 	}

@@ -1104,9 +1104,9 @@ void hci_smp_irks_clear(struct hci_dev *hdev)
 
 void hci_blocked_keys_clear(struct hci_dev *hdev)
 {
-	struct blocked_key *b;
+	struct blocked_key *b, *tmp;
 
-	list_for_each_entry(b, &hdev->blocked_keys, list) {
+	list_for_each_entry_safe(b, tmp, &hdev->blocked_keys, list) {
 		list_del_rcu(&b->list);
 		kfree_rcu(b, rcu);
 	}

2.34.1

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Dear submitter,

Thank you for submitting the patches to the linux bluetooth mailing list. This is a CI test results with your patch series:
PW Link:https://patchwork.kernel.org/project/bluetooth/list/?series=773609

---Test result---

Test Summary:

CheckPatch                    PASS      0.65 seconds
GitLint                       PASS      0.29 seconds
SubjectPrefix                 PASS      0.10 seconds
BuildKernel                   PASS      34.64 seconds
CheckAllWarning               PASS      38.75 seconds
CheckSparse                   PASS      45.45 seconds
CheckSmatch                   PASS      125.79 seconds
BuildKernel32                 PASS      37.24 seconds
TestRunnerSetup               PASS      545.64 seconds
TestRunner_l2cap-tester       PASS      25.96 seconds
TestRunner_iso-tester         PASS      50.74 seconds
TestRunner_bnep-tester        PASS      11.92 seconds
TestRunner_mgmt-tester        PASS      228.35 seconds
TestRunner_rfcomm-tester      PASS      17.79 seconds
TestRunner_sco-tester         PASS      20.39 seconds
TestRunner_ioctl-tester       PASS      19.50 seconds
TestRunner_mesh-tester        PASS      15.40 seconds
TestRunner_smp-tester         PASS      16.13 seconds
TestRunner_userchan-tester    PASS      12.86 seconds
IncrementalBuild              PASS      35.33 seconds

---
Regards,
Linux Bluetooth