[PATCH 1/6] netfilter: nf_tables: fix memory leak if expr init fails

[Pablo Neira Ayuso]

From: Liping Zhang <liping.zh...@spreadtrum.com>

If expr init fails then we need to free it.

So when the user add a nft rule as follows:

  # nft add rule filter input tcp dport 22 flow table ssh \
    { ip saddr limit rate 0/second }

memory leak will happen.

Signed-off-by: Liping Zhang <liping.zh...@spreadtrum.com>
Signed-off-by: Pablo Neira Ayuso <pa...@netfilter.org>
---
 net/netfilter/nf_tables_api.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 2c88187..cf7c745 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -1724,9 +1724,11 @@ struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
 
        err = nf_tables_newexpr(ctx, &info, expr);
        if (err < 0)
-               goto err2;
+               goto err3;
 
        return expr;
+err3:
+       kfree(expr);
 err2:
        module_put(info.ops->type->owner);
 err1:
-- 
2.1.4

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