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zebra: prevent crash when nhlfe is NULL

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There exists a call path where the nhlfe_alloc can return NULL
for blackhole nexthops.  In this case we were still trying
to save the nhlfe pointer causing a crash when we attempted
to add it to a self-contained list.

Signed-off-by: Donald Sharp <sharpd@nvidia.com>
This commit is contained in:
Donald Sharp 2021-08-04 13:38:25 -04:00
parent b7457b40cd
commit 6140b3b41b
1 changed files with 3 additions and 0 deletions
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3
zebra/zebra_mpls.c
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@ -1323,6 +1323,9 @@ static zebra_nhlfe_t *nhlfe_add(zebra_lsp_t *lsp, enum lsp_types_t lsp_type,
nhlfe = nhlfe_alloc(lsp, lsp_type, gtype, gate, ifindex, num_labels,
labels);
if (!nhlfe)
return NULL;
/* Enqueue to LSP: primaries at head of list, backups at tail */
if (is_backup) {
SET_FLAG(nhlfe->flags, NHLFE_FLAG_IS_BACKUP);