skbuff: skb_copy_ubufs must release uarg even without user frags

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[ Upstream commit b90ddd5687 ]

skb_copy_ubufs creates a private copy of frags[] to release its hold
on user frags, then calls uarg->callback to notify the owner.

Call uarg->callback even when no frags exist. This edge case can
happen when zerocopy_sg_from_iter finds enough room in skb_headlen
to copy all the data.

Fixes: 3ece782693 ("sock: skb_copy_ubufs support for compound pages")
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Willem de Bruijn 2017-12-20 17:37:50 -05:00 • committed by Greg Kroah-Hartman

parent 17155ea827

commit 49cd180d4a

1 changed files with 2 additions and 1 deletions

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net/core/skbuff.c

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