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authorEric Dumazet <edumazet@google.com>2017-04-26 09:07:46 -0700
committerDavid S. Miller <davem@davemloft.net>2017-04-28 16:06:47 -0400
commitc21b48cc1bbf2f5af3ef54ada559f7fadf8b508b (patch)
treea350a8306a8b8e0d502d57374aef0967d2944b5f /.mailmap
parent7162fb242cb8322beb558828fd26b33c3e9fc805 (diff)
downloadlinux-c21b48cc1bbf2f5af3ef54ada559f7fadf8b508b.tar.bz2
net: adjust skb->truesize in ___pskb_trim()
Andrey found a way to trigger the WARN_ON_ONCE(delta < len) in skb_try_coalesce() using syzkaller and a filter attached to a TCP socket. As we did recently in commit 158f323b9868 ("net: adjust skb->truesize in pskb_expand_head()") we can adjust skb->truesize from ___pskb_trim(), via a call to skb_condense(). If all frags were freed, then skb->truesize can be recomputed. This call can be done if skb is not yet owned, or destructor is sock_edemux(). Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: Andrey Konovalov <andreyknvl@google.com> Cc: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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