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57 lines
2.2 KiB
Diff
57 lines
2.2 KiB
Diff
From: Sven Eckelmann <sven@narfation.org>
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Date: Thu, 6 Sep 2018 14:35:27 +0200
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Subject: batman-adv: Prevent duplicated global TT entry
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The function batadv_tt_global_orig_entry_add is responsible for adding new
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tt_orig_list_entry to the orig_list. It first checks whether the entry
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already is in the list or not. If it is, then the creation of a new entry
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is aborted.
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But the lock for the list is only held when the list is really modified.
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This could lead to duplicated entries because another context could create
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an entry with the same key between the check and the list manipulation.
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The check and the manipulation of the list must therefore be in the same
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locked code section.
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Fixes: c5eb5bb30321 ("batman-adv: add reference counting for type batadv_tt_orig_list_entry")
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Signed-off-by: Sven Eckelmann <sven@narfation.org>
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Acked-by: Marek Lindner <mareklindner@neomailbox.ch>
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Origin: upstream, https://git.open-mesh.org/batman-adv.git/commit/79097255a1a3e1bd1949be309af941181fbc7b36
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diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
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index 9efbdd6348c4d69c525b3e0574d2b24db838c086..7502cb54c152d06d78c88d9f8fb841cada9f3b5d 100644
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--- a/net/batman-adv/translation-table.c
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+++ b/net/batman-adv/translation-table.c
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@@ -1613,6 +1613,8 @@ batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
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{
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struct batadv_tt_orig_list_entry *orig_entry;
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+ spin_lock_bh(&tt_global->list_lock);
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+
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orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node);
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if (orig_entry) {
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/* refresh the ttvn: the current value could be a bogus one that
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@@ -1635,11 +1637,9 @@ batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
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orig_entry->flags = flags;
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kref_init(&orig_entry->refcount);
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- spin_lock_bh(&tt_global->list_lock);
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kref_get(&orig_entry->refcount);
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hlist_add_head_rcu(&orig_entry->list,
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&tt_global->orig_list);
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- spin_unlock_bh(&tt_global->list_lock);
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atomic_inc(&tt_global->orig_list_count);
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sync_flags:
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@@ -1647,6 +1647,8 @@ batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
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out:
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if (orig_entry)
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batadv_tt_orig_list_entry_put(orig_entry);
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+
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+ spin_unlock_bh(&tt_global->list_lock);
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}
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/**
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