bgpd: Fix crash in bgp_labelpool (backport #18079) #18144
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The bgp labelpool code is grabbing the vpn policy data structure. This vpn_policy has a pointer to the bgp data structure. If a item placed on the bgp label pool workqueue happens to sit there for the microsecond or so and the operator issues a `no router bgp...` command that corresponds to the vpn_policy bgp pointer, when the workqueue is run it will crash because the bgp pointer is now freed and something else owns it. Modify the labelpool code to store the vrf id associated with the request on the workqueue. When you wake up if the vrf id still has a bgp pointer allow the request to continue, else drop it. Signed-off-by: Donald Sharp <[email protected]> (cherry picked from commit 14eac31)
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The bgp labelpool code is grabbing the vpn policy data structure. This vpn_policy has a pointer to the bgp data structure. If a item placed on the bgp label pool workqueue happens to sit there for the microsecond or so and the operator issues a
no router bgp...command that corresponds to the vpn_policy bgp pointer, when the workqueue is run it will crash because the bgp pointer is now freed and something else owns it.Modify the labelpool code to store the vrf id associated with the request on the workqueue. When you wake up if the vrf id still has a bgp pointer allow the request to continue, else drop it.
This is an automatic backport of pull request #18079 done by Mergify.