netfilter: nft_compat: fix error path in nft_parse_compat()

The patch 0ca743a55991: "netfilter: nf_tables: add compatibility
layer for x_tables", leads to the following Smatch

 warning: "net/netfilter/nft_compat.c:140 nft_parse_compat()
          warn: signedness bug returning '(-34)'"

This nft_parse_compat function returns error codes but the return
type is u8 so the error codes are transformed into small positive
values. The callers don't check the return.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 13 insertions, 6 deletions

diff --git a/net/netfilter/nft_compat.c b/net/netfilter/nft_compat.c
index a82667c64729..da0c1f4ada12 100644
--- a/net/netfilter/nft_compat.c
+++ b/net/netfilter/nft_compat.c
@@ -128,7 +128,7 @@ static const struct nla_policy nft_rule_compat_policy[NFTA_RULE_COMPAT_MAX + 1]
         [NFTA_RULE_COMPAT_FLAGS]        = { .type = NLA_U32 },
 };
 
-static u8 nft_parse_compat(const struct nlattr *attr, bool *inv)
+static int nft_parse_compat(const struct nlattr *attr, u8 *proto, bool *inv)
 {
         struct nlattr *tb[NFTA_RULE_COMPAT_MAX+1];
         u32 flags;
@@ -148,7 +148,8 @@ static u8 nft_parse_compat(const struct nlattr *attr, bool *inv)
         if (flags & NFT_RULE_COMPAT_F_INV)
                 *inv = true;
 
-        return ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_PROTO]));
+        *proto = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_PROTO]));
+        return 0;
 }
 
 static int
@@ -166,8 +167,11 @@ nft_target_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
 
         target_compat_from_user(target, nla_data(tb[NFTA_TARGET_INFO]), info);
 
-        if (ctx->nla[NFTA_RULE_COMPAT])
-                proto = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &inv);
+        if (ctx->nla[NFTA_RULE_COMPAT]) {
+                ret = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &proto, &inv);
+                if (ret < 0)
+                        goto err;
+        }
 
         nft_target_set_tgchk_param(&par, ctx, target, info, &e, proto, inv);
 
@@ -356,8 +360,11 @@ nft_match_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
 
         match_compat_from_user(match, nla_data(tb[NFTA_MATCH_INFO]), info);
 
-        if (ctx->nla[NFTA_RULE_COMPAT])
-                proto = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &inv);
+        if (ctx->nla[NFTA_RULE_COMPAT]) {
+                ret = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &proto, &inv);
+                if (ret < 0)
+                        goto err;
+        }
 
         nft_match_set_mtchk_param(&par, ctx, match, info, &e, proto, inv);