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pimd: vrf may be NULL from pim_cmd_lookup_vrf

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The call into pim_cmd_lookup_vrf may be NULL
and dereferencing it before ensuring that the
vrf pointer is non-NULL is a good way to crash.

A crash can be initiated in pim:

eva# show ip msdp vrf NOEXIST mesh-group
vtysh: error reading from pimd: Permission denied (13)Warning: closing connection to pimd because of an I/O error!
eva# 2022/08/15 11:47:38 [PHJDC-499N2][EC 100663314] STARVATION: task vtysh_rl_read (560b77f76de6) ran for 16777ms (cpu time 0ms)

eva#

Signed-off-by: Donald Sharp <sharpd@nvidia.com>
This commit is contained in:
Donald Sharp 2022-08-15 11:43:27 -04:00
parent e89de02895
commit bddd6bb95e
1 changed files with 2 additions and 1 deletions
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3
pimd/pim_cmd.c
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@ -5526,12 +5526,13 @@ DEFUN (show_ip_msdp_mesh_group,
int idx = 2;
struct pim_msdp_mg *mg;
struct vrf *vrf = pim_cmd_lookup_vrf(vty, argv, argc, &idx);
struct pim_instance *pim = vrf->info;
struct pim_instance *pim;
struct json_object *json = NULL;
if (!vrf)
return CMD_WARNING;
pim = vrf->info;
/* Quick case: list is empty. */
if (SLIST_EMPTY(&pim->msdp.mglist)) {
if (uj)