[51/53] batman-adv: add sanity check when removing global tts

[Greg KH]

3.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Simon Wunderlich <simon.wunderlich@xxxxxxxxxxxxxxxxxxxx>

commit 6e8014947d6469df1566e9e253805557c5c0e4e0 upstream.

After removing the batman-adv module, the hash may be already gone
when tt_global_del_orig() tries to clean the hash. This patch adds
a sanity check to avoid this.

Signed-off-by: Simon Wunderlich <siwu@xxxxxxxxxxxxxxxxxx>
Tested-by: Alexey Fisher <bug-track@xxxxxxxxxxxxxxxxx>
Signed-off-by: Marek Lindner <lindner_marek@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 net/batman-adv/translation-table.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -698,6 +698,9 @@ void tt_global_del_orig(struct bat_priv
 	struct hlist_head *head;
 	spinlock_t *list_lock; /* protects write access to the hash lists */
 
+	if (!hash)
+		return;
+
 	for (i = 0; i < hash->size; i++) {
 		head = &hash->table[i];
 		list_lock = &hash->list_locks[i];


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