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netfilter: nf_tables: fix memory leak on error exit return 

commit f0dfd7a2b3 upstream.

Currently the -EBUSY error return path is not free'ing resources
allocated earlier, leaving a memory leak. Fix this by exiting via the
error exit label err5 that performs the necessary resource clean
up.

Detected by CoverityScan, CID#1432975 ("Resource leak")

Fixes: 9744a6fcef ("netfilter: nf_tables: check if same extensions are set when adding elements")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Colin Ian King 2018-05-09 13:22:56 +01:00 committed by Greg Kroah-Hartman
parent 174757e28b
commit 082711fa31
1 changed files with 4 additions and 2 deletions
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6
net/netfilter/nf_tables_api.c
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@ -3999,8 +3999,10 @@ static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
return -EBUSY;
nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) {
err = -EBUSY;
goto err5;
}
if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
memcmp(nft_set_ext_data(ext),