[ovs-git] Open vSwitch: bond: Fix segfault sending learning packets with LACP disabled. (branch-1.6)

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commit e6128b241b8fb28fa8480c5a9bfd36942f70efdc
Diffs: http://openvswitch.org/cgi-bin/gitweb.cgi?p=openvswitch;a=commitdiff;h=e6128b241b8fb28fa8480c5a9bfd36942f70efdc
Author: Ben Pfaff <blp at nicira.com>
		
bond: Fix segfault sending learning packets with LACP disabled.
		
It is essentially an invalid configuration to disable LACP but request TCP
balancing: in this configuration, the bond drops all packets.  But
may_send_learning_packets() would still indicate that learning packets
should be sent, so bond_compose_learning_packet() would try to choose an
output slave for those packets, which would be NULL (because all packets
are dropped), which would cause a segfault upon dereference.

This commit fixes the problem by making may_send_learning_packets() no
longer indicate that learning packets should be sent.

I tested this issue by modifying bond_should_send_learning_packets() to
always return true if may_send_learning_packets() returns true, and then
introducing the invalid configuration described above.  Without this comit,
ovs-vswitchd segfaults quickly; with this commit, it does not.

Bug #14090.
Reported-by: Kiran Shanbhog <kiran at vmware.com>
Signed-off-by: Ben Pfaff <blp at nicira.com>


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Summary of changes:
 lib/bond.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)


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