ipv6: fix overlap check for fragments
The type of FRAG6_CB(prev)->offset is int, skb->len is *unsigned* int, and offset is int. Without this patch, type conversion occurred to this expression, when (FRAG6_CB(prev)->offset + prev->len) is less than offset. Signed-off-by: Shan Wei <shanwei@cn.fujitsu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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