From: Jon Maloy <jon.ma...@ericsson.com>
Date: Mon, 19 Oct 2015 11:43:11 -0400
> In commit d999297c3dbbe ("tipc: reduce locking scope during packet reception")
> we altered the packet retransmission function. Since then, when
> restransmitting packets, we create a clone of the original buffer
> using __pskb_copy(skb, MIN_H_SIZE), where MIN_H_SIZE is the size of
> the area we want to have copied, but also the smallest possible TIPC
> packet size. The value of MIN_H_SIZE is 24.
>
> Unfortunately, __pskb_copy() also has the effect that the headroom
> of the cloned buffer takes the size MIN_H_SIZE. This is too small
> for carrying the packet over the UDP tunnel bearer, which requires
> a minimum headroom of 28 bytes. A change to just use pskb_copy()
> lets the clone inherit the original headroom of 80 bytes, but also
> assumes that the copied data area is of at least that size, something
> that is not always the case. So that is not a viable solution.
>
> We now fix this by adding a check for sufficient headroom in the
> transmit function of udp_media.c, and expanding it when necessary.
>
> Fixes: commit d999297c3dbbe ("tipc: reduce locking scope during packet
> reception")
> Signed-off-by: Jon Maloy <jon.ma...@ericsson.com>
Applied.
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