In below snip of code in llc_fixup_skb we calculate pdulen from eth_hdr(skb)->h_proto which contains total length of packet include ETH_HLEN.

<snip>
119         if (skb->protocol == htons(ETH_P_802_2)) {
120                 __be16 pdulen = eth_hdr(skb)->h_proto;
121                 s32 data_size = ntohs(pdulen) - llc_len;
122 
123                 if (data_size < 0 ||
124                     !pskb_may_pull(skb, data_size))
125                         return 0;

</snip>


Line 121 should be changed to 

121                 s32 data_size = ntohs(pdulen) - llc_len - ETH_HLEN;



Log
---
kernel: pdu len 18432(72), data_size 69
kernel: skb len 55, skb data_len 0