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| author | Eric Dumazet <edumazet@google.com> | 2017-04-27 00:15:40 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-05-14 12:00:20 (GMT) |
| commit | f3235cbd5be15aa084d5561c2eb8492ed68cd7e5 (patch) | |
| tree | c661126b93152af4b9fe70d2c04e1f143acbcdd3 /samples | |
| parent | 3b0129d4111e53927c2bc3c6b78a2b12ad71268b (diff) | |
| download | linux-f3235cbd5be15aa084d5561c2eb8492ed68cd7e5.tar.xz | |
tcp: do not underestimate skb->truesize in tcp_trim_head()
[ Upstream commit 7162fb242cb8322beb558828fd26b33c3e9fc805 ]
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 over loopback interface.
I believe one issue with looped skbs is that tcp_trim_head() can end up
producing skb with under estimated truesize.
It hardly matters for normal conditions, since packets sent over
loopback are never truncated.
Bytes trimmed from skb->head should not change skb truesize, since
skb->head is not reallocated.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Tested-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'samples')
0 files changed, 0 insertions, 0 deletions