netfilter: nft_compat: narrow down revision to unsigned 8-bits

[ Upstream commit 36fa8d697132b4bed2312d700310e8a78b000c84 ]

xt_find_revision() expects u8, restrict it to this datatype.

Fixes: 0ca743a55991 ("netfilter: nf_tables: add compatibility layer for x_tables")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/netfilter/nft_compat.c b/net/netfilter/nft_compat.c
index f0eeda9..001b684 100644 (file)
--- a/net/netfilter/nft_compat.c
+++ b/net/netfilter/nft_compat.c
@@ -135,7 +135,7 @@ static void nft_target_eval_bridge(const struct nft_expr *expr,
 
 static const struct nla_policy nft_target_policy[NFTA_TARGET_MAX + 1] = {
        [NFTA_TARGET_NAME]      = { .type = NLA_NUL_STRING },
-       [NFTA_TARGET_REV]       = { .type = NLA_U32 },
+       [NFTA_TARGET_REV]       = NLA_POLICY_MAX(NLA_BE32, 255),
        [NFTA_TARGET_INFO]      = { .type = NLA_BINARY },
 };
 
@@ -419,7 +419,7 @@ static void nft_match_eval(const struct nft_expr *expr,
 
 static const struct nla_policy nft_match_policy[NFTA_MATCH_MAX + 1] = {
        [NFTA_MATCH_NAME]       = { .type = NLA_NUL_STRING },
-       [NFTA_MATCH_REV]        = { .type = NLA_U32 },
+       [NFTA_MATCH_REV]        = NLA_POLICY_MAX(NLA_BE32, 255),
        [NFTA_MATCH_INFO]       = { .type = NLA_BINARY },
 };
 
@@ -724,7 +724,7 @@ out_put:
 static const struct nla_policy nfnl_compat_policy_get[NFTA_COMPAT_MAX+1] = {
        [NFTA_COMPAT_NAME]      = { .type = NLA_NUL_STRING,
                                    .len = NFT_COMPAT_NAME_MAX-1 },
-       [NFTA_COMPAT_REV]       = { .type = NLA_U32 },
+       [NFTA_COMPAT_REV]       = NLA_POLICY_MAX(NLA_BE32, 255),
        [NFTA_COMPAT_TYPE]      = { .type = NLA_U32 },
 };