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authorJon Paul Maloy <jon.maloy@ericsson.com>2016-06-20 09:20:46 -0400
committerDavid S. Miller <davem@davemloft.net>2016-06-22 16:33:35 -0400
commit27777daa8b6df0c19aaf591d1536a586b3eb5e36 (patch)
treebd1f497b8fa1a78ecef25876eb28dceb37604408 /Documentation
parentd19af0a76444fde629667ecb823c0ee28f9f67d8 (diff)
tipc: unclone unbundled buffers before forwarding
When extracting an individual message from a received "bundle" buffer, we just create a clone of the base buffer, and adjust it to point into the right position of the linearized data area of the latter. This works well for regular message reception, but during periods of extremely high load it may happen that an extracted buffer, e.g, a connection probe, is reversed and forwarded through an external interface while the preceding extracted message is still unhandled. When this happens, the header or data area of the preceding message will be partially overwritten by a MAC header, leading to unpredicatable consequences, such as a link reset. We now fix this by ensuring that the msg_reverse() function never returns a cloned buffer, and that the returned buffer always contains sufficient valid head and tail room to be forwarded. Reported-by: Erik Hugne <erik.hugne@gmail.com> Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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