mirror of https://github.com/hak5/openwrt.git
61 lines
1.6 KiB
Diff
61 lines
1.6 KiB
Diff
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From: Ben Greear <greearb@candelatech.com>
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Date: Fri, 1 Apr 2016 14:12:09 -0700
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Subject: [PATCH] ath10k: Ensure peer_map references are cleaned up.
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While debugging OS crashes due to firmware crashes, I enabled
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kasan, and it noticed that peer objects were being used-after-freed.
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Looks like there are two places we could be leaving stale references
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in the peer-map, so clean that up.
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Signed-off-by: Ben Greear <greearb@candelatech.com>
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---
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--- a/drivers/net/wireless/ath/ath10k/mac.c
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+++ b/drivers/net/wireless/ath/ath10k/mac.c
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@@ -773,6 +773,7 @@ static void ath10k_peer_cleanup(struct a
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{
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struct ath10k_peer *peer, *tmp;
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int peer_id;
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+ int i;
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lockdep_assert_held(&ar->conf_mutex);
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@@ -789,6 +790,17 @@ static void ath10k_peer_cleanup(struct a
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ar->peer_map[peer_id] = NULL;
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}
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+ /* Double check that peer is properly un-referenced from
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+ * the peer_map
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+ */
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+ for (i = 0; i < ARRAY_SIZE(ar->peer_map); i++) {
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+ if (ar->peer_map[i] == peer) {
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+ ath10k_warn(ar, "removing stale peer_map entry for %pM (ptr %p idx %d)\n",
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+ peer->addr, peer, i);
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+ ar->peer_map[i] = NULL;
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+ }
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+ }
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+
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list_del(&peer->list);
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kfree(peer);
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ar->num_peers--;
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@@ -799,6 +811,7 @@ static void ath10k_peer_cleanup(struct a
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static void ath10k_peer_cleanup_all(struct ath10k *ar)
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{
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struct ath10k_peer *peer, *tmp;
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+ int i;
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lockdep_assert_held(&ar->conf_mutex);
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@@ -807,6 +820,10 @@ static void ath10k_peer_cleanup_all(stru
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list_del(&peer->list);
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kfree(peer);
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}
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+
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+ for (i = 0; i < ARRAY_SIZE(ar->peer_map); i++)
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+ ar->peer_map[i] = NULL;
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+
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spin_unlock_bh(&ar->data_lock);
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ar->num_peers = 0;
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