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[7.5]zebra: Fix use after free in debug path #7331

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Oct 18, 2020
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[7.5]zebra: Fix use after free in debug path #7331

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11 changes: 10 additions & 1 deletion zebra/zebra_rib.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2245,9 +2245,18 @@ static void process_subq_route(struct listnode *lnode, uint8_t qindex)
rib_process(rnode);

if (IS_ZEBRA_DEBUG_RIB_DETAILED) {
struct route_entry *re = re_list_first(&dest->routes);
struct route_entry *re = NULL;
char buf[SRCDEST2STR_BUFFER];

/*
* rib_process may have freed the dest
* as part of the garbage collection. Let's
* prevent stupidity from happening.
*/
dest = rib_dest_from_rnode(rnode);
if (dest)
re = re_list_first(&dest->routes);

srcdest_rnode2str(rnode, buf, sizeof(buf));
zlog_debug("%s(%u:%u):%s: rn %p dequeued from sub-queue %u",
zvrf_name(zvrf), zvrf_id(zvrf), re ? re->table : 0, buf,
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