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H A D | skbuff.c | 3bdd5ee0 Wed Jun 09 17:41:57 CDT 2021 Willem de Bruijn <willemb@google.com> skbuff: fix incorrect msg_zerocopy copy notifications
msg_zerocopy signals if a send operation required copying with a flag in serr->ee.ee_code.
This field can be incorrect as of the below commit, as a result of both structs uarg and serr pointing into the same skb->cb[].
uarg->zerocopy must be read before skb->cb[] is reinitialized to hold serr. Similar to other fields len, hi and lo, use a local variable to temporarily hold the value.
This was not a problem before, when the value was passed as a function argument.
Fixes: 75518851a2a0 ("skbuff: Push status and refcounts into sock_zerocopy_callback") Reported-by: Talal Ahmad <talalahmad@google.com> Signed-off-by: Willem de Bruijn <willemb@google.com> Acked-by: Soheil Hassas Yeganeh <soheil@google.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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