From: Alexey Kodanev <[email protected]>
Date: Thu, 15 Feb 2018 20:18:43 +0300
> Since UDP-Lite is always using checksum, the following path is
> triggered when calculating pseudo header for it:
>
> udp4_csum_init() or udp6_csum_init()
> skb_checksum_init_zero_check()
> __skb_checksum_validate_complete()
>
> The problem can appear if skb->len is less than CHECKSUM_BREAK. In
> this particular case __skb_checksum_validate_complete() also invokes
> __skb_checksum_complete(skb). If UDP-Lite is using partial checksum
> that covers only part of a packet, the function will return bad
> checksum and the packet will be dropped.
>
> It can be fixed if we skip skb_checksum_init_zero_check() and only
> set the required pseudo header checksum for UDP-Lite with partial
> checksum before udp4_csum_init()/udp6_csum_init() functions return.
>
> Fixes: ed70fcfcee95 ("net: Call skb_checksum_init in IPv4")
> Fixes: e4f45b7f40bd ("net: Call skb_checksum_init in IPv6")
> Signed-off-by: Alexey Kodanev <[email protected]>
Applied and queued up for -stable, thanks Alexey.
