[PATCH net 06/12] netfilter: nft_set_rbtree: check catchall_sync return before queue_done

[Pablo Neira Ayuso <pablo@netfilter.org>]

From: Xingyuan Mo <hdthky0@gmail.com>

nft_rbtree_gc_queue() passes the result of nft_trans_gc_catchall_sync()
straight to nft_trans_gc_queue_sync_done(). When the catchall path flushes
a full GC batch and nft_trans_gc_alloc() fails, catchall_sync returns
NULL and queue_sync_done dereferences trans->net (NULL+0x10). Guard the
call like the pipapo GC path already does.

Fixes: 7d259f021aaa ("netfilter: nft_set_rbtree: prefer sync gc to async worker")
Assisted-by: opencode:deepseek-v4
Signed-off-by: Xingyuan Mo <hdthky0@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/netfilter/nft_set_rbtree.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/netfilter/nft_set_rbtree.c b/net/netfilter/nft_set_rbtree.c
index fbe1750f1ca2..9d685899da70 100644
--- a/net/netfilter/nft_set_rbtree.c
+++ b/net/netfilter/nft_set_rbtree.c
@@ -953,7 +953,8 @@ static void nft_rbtree_gc_queue(struct nft_set *set)
 	}
 
 	gc = nft_trans_gc_catchall_sync(gc);
-	nft_trans_gc_queue_sync_done(gc);
+	if (gc)
+		nft_trans_gc_queue_sync_done(gc);
 }
 
 static u64 nft_rbtree_privsize(const struct nlattr * const nla[],
-- 
2.47.3