Patch "netfilter: nf_tables: validate chain type update if available" has been added to the 6.6-stable tree

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This is a note to let you know that I've just added the patch titled

    netfilter: nf_tables: validate chain type update if available

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     netfilter-nf_tables-validate-chain-type-update-if-av.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit bdf32faca4085f67a09a954ce6d3aa21c6643b32
Author: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Date:   Thu Dec 14 22:43:22 2023 +0100

    netfilter: nf_tables: validate chain type update if available
    
    [ Upstream commit aaba7ddc8507f4ad5bbd07988573967632bc2385 ]
    
    Parse netlink attribute containing the chain type in this update, to
    bail out if this is different from the existing type.
    
    Otherwise, it is possible to define a chain with the same name, hook and
    priority but different type, which is silently ignored.
    
    Fixes: 96518518cc41 ("netfilter: add nftables")
    Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 24cad36565d7..5822912045ef 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -2263,7 +2263,16 @@ static int nft_chain_parse_hook(struct net *net,
 				return -EOPNOTSUPP;
 		}
 
-		type = basechain->type;
+		if (nla[NFTA_CHAIN_TYPE]) {
+			type = __nf_tables_chain_type_lookup(nla[NFTA_CHAIN_TYPE],
+							     family);
+			if (!type) {
+				NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
+				return -ENOENT;
+			}
+		} else {
+			type = basechain->type;
+		}
 	}
 
 	if (!try_module_get(type->owner)) {




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