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pim6d: Fix crash in ipv6 pim command

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Problem:
Execute the below commands, pim6d core happens.
interface ens193
 ip address 69.0.0.2/24
 ipv6 address 8000::1/120
 ipv6 mld
 ipv6 pim
We see crash only if the interface is not configured, and
we are executing PIM/MLD commands.

RootCause:
Interface ens193 is not configured. So, it will have
ifindex = 0 and mroute_vif_index = -1.
Currently, we don't enable MLD on an interface if
mroute_vif_index < 0. So, pim_ifp->MLD = NULL.
In the API pim_if_membership_refresh(), we are accessing
pim_ifp->MLD NULL pointer which leads to crash.

Fix:
Added NULL check before accessing pim_ifp->MLD pointer in
the API pim_if_membership_refresh().

Issue: #13385

Signed-off-by: Sarita Patra <saritap@vmware.com>
(cherry picked from commit 6d1d2c27a3)
This commit is contained in:
Sarita Patra 2023-05-05 10:52:33 -07:00 committed by Mergify
parent 6034c57d08
commit 0e1bf2a4d8
1 changed files with 5 additions and 3 deletions
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8
pimd/pim_nb_config.c
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@ -94,15 +94,17 @@ static void pim_if_membership_refresh(struct interface *ifp)
pim_ifp = ifp->info;
assert(pim_ifp);
#if PIM_IPV == 6
gm_ifp = pim_ifp->mld;
#endif
if (!pim_ifp->pim_enable)
return;
if (!pim_ifp->gm_enable)
return;
#if PIM_IPV == 6
gm_ifp = pim_ifp->mld;
if (!gm_ifp)
return;
#endif
/*
* First clear off membership from all PIM (S,G) entries on the
* interface