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authorDaniel Borkmann <dborkman@redhat.com>2014-12-03 12:13:58 +0100
committerBen Hutchings <ben@decadent.org.uk>2015-01-01 01:27:52 +0000
commit85c3fe917f5459427c4ba5797332f9910400afeb (patch)
tree36fda08691b9f38095e91a4a31ca761128f2fd9a
parentab25611227cffac1b1bc8e115e0719158ac8568c (diff)
net: sctp: use MAX_HEADER for headroom reserve in output path
commit 9772b54c55266ce80c639a80aa68eeb908f8ecf5 upstream. To accomodate for enough headroom for tunnels, use MAX_HEADER instead of LL_MAX_HEADER. Robert reported that he has hit after roughly 40hrs of trinity an skb_under_panic() via SCTP output path (see reference). I couldn't reproduce it from here, but not using MAX_HEADER as elsewhere in other protocols might be one possible cause for this. In any case, it looks like accounting on chunks themself seems to look good as the skb already passed the SCTP output path and did not hit any skb_over_panic(). Given tunneling was enabled in his .config, the headroom would have been expanded by MAX_HEADER in this case. Reported-by: Robert Święcki <robert@swiecki.net> Reference: https://lkml.org/lkml/2014/12/1/507 Fixes: 594ccc14dfe4d ("[SCTP] Replace incorrect use of dev_alloc_skb with alloc_skb in sctp_packet_transmit().") Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Acked-by: Vlad Yasevich <vyasevich@gmail.com> Acked-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
-rw-r--r--net/sctp/output.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/sctp/output.c b/net/sctp/output.c
index 5bd9aa93139d..c3b85497d0ab 100644
--- a/net/sctp/output.c
+++ b/net/sctp/output.c
@@ -384,12 +384,12 @@ int sctp_packet_transmit(struct sctp_packet *packet)
sk = chunk->skb->sk;
/* Allocate the new skb. */
- nskb = alloc_skb(packet->size + LL_MAX_HEADER, GFP_ATOMIC);
+ nskb = alloc_skb(packet->size + MAX_HEADER, GFP_ATOMIC);
if (!nskb)
goto nomem;
/* Make sure the outbound skb has enough header room reserved. */
- skb_reserve(nskb, packet->overhead + LL_MAX_HEADER);
+ skb_reserve(nskb, packet->overhead + MAX_HEADER);
/* Set the owning socket so that we know where to get the
* destination IP address.