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authorIan Wienand <iwienand@redhat.com>2016-08-03 15:44:57 +1000
committerDavid S. Miller <davem@davemloft.net>2016-08-06 00:06:11 -0400
commit5ef9f289c4e698054e5687edb54f0da3cdc9173a (patch)
tree917fe7b0dcabc632616371adae06a06ac550ae2d /drivers/net
parentMerge branch 'qlcnic-fixes' (diff)
downloadlinux-dev-5ef9f289c4e698054e5687edb54f0da3cdc9173a.tar.xz
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OVS: Ignore negative headroom value
net_device->ndo_set_rx_headroom (introduced in 871b642adebe300be2e50aa5f65a418510f636ec) says "Setting a negtaive value reset the rx headroom to the default value". It seems that the OVS implementation in 3a927bc7cf9d0fbe8f4a8189dd5f8440228f64e7 overlooked this and sets dev->needed_headroom unconditionally. This doesn't have an immediate effect, but can mess up later LL_RESERVED_SPACE calculations, such as done in net/ipv6/mcast.c:mld_newpack. For reference, this issue was found from a skb_panic raised there after the length calculations had given the wrong result. Note the other current users of this interface (drivers/net/tun.c:tun_set_headroom and drivers/net/veth.c:veth_set_rx_headroom) are both checking this correctly thus need no modification. Thanks to Ben for some pointers from the crash dumps! Cc: Benjamin Poirier <bpoirier@suse.com> Cc: Paolo Abeni <pabeni@redhat.com> Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1361414 Signed-off-by: Ian Wienand <iwienand@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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