Thread (7 messages) flat view 7 messages, 2 authors, 2023-06-07
STALE1198d

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[PATCH net 5/5] netfilter: nf_tables: out-of-bound check in chain blob

From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: 2023-06-06 22:59:02
Also in: netfilter-devel
Subsystem: netfilter, networking [general], the rest · Maintainers: Pablo Neira Ayuso, Florian Westphal, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds 

Add current size of rule expressions to the boundary check.

Fixes: 2c865a8a28a1 ("netfilter: nf_tables: add rule blob layout")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/netfilter/nf_tables_api.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 3445b8e1f462..0519d45ede6b 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -9007,7 +9007,7 @@ static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *cha
 				continue;
 			}
 
-			if (WARN_ON_ONCE(data + expr->ops->size > data_boundary))
+			if (WARN_ON_ONCE(data + size + expr->ops->size > data_boundary))
 				return -ENOMEM;
 
 			memcpy(data + size, expr, expr->ops->size);
-- 
2.30.2
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