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batman-adv: fix kernel crash due to missing NULL checks
batadv_softif_vlan_get() may return NULL which has to be verified by the caller. Fixes: 35df3b2 ("batman-adv: fix TT VLAN inconsistency on VLAN re-add") Reported-by: Ryan Thompson <[email protected]> Signed-off-by: Marek Lindner <[email protected]> Signed-off-by: Antonio Quartulli <[email protected]>
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