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| author | Liping Zhang <liping.zhang@spreadtrum.com> | 2016-07-18 20:44:15 +0800 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2016-07-21 02:32:32 +0200 |
| commit | c2d9a4293ced88d7dad7c35c893a31f49f8b64f5 (patch) | |
| tree | 991574c5890d8043667b50ff3d4389feee526142 /net/netfilter | |
| parent | 82de0be6862cdca2e6802267bda57cfc8844d3a7 (diff) | |
| download | linux-c2d9a4293ced88d7dad7c35c893a31f49f8b64f5.tar.gz linux-c2d9a4293ced88d7dad7c35c893a31f49f8b64f5.tar.xz | |
netfilter: nft_log: fix possible memory leak if log expr init fail
Suppose that we specify the NFTA_LOG_PREFIX, then NFTA_LOG_LEVEL
and NFTA_LOG_GROUP are specified together or nf_logger_find_get
call returns fail, i.e. expr init fail, memory leak will happen.
Signed-off-by: Liping Zhang <liping.zhang@spreadtrum.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter')
| -rw-r--r-- | net/netfilter/nft_log.c | 26 |
1 files changed, 18 insertions, 8 deletions
diff --git a/net/netfilter/nft_log.c b/net/netfilter/nft_log.c index 713d66837705..e1b34ff0ebd0 100644 --- a/net/netfilter/nft_log.c +++ b/net/netfilter/nft_log.c @@ -52,6 +52,14 @@ static int nft_log_init(const struct nft_ctx *ctx, struct nft_log *priv = nft_expr_priv(expr); struct nf_loginfo *li = &priv->loginfo; const struct nlattr *nla; + int err; + + li->type = NF_LOG_TYPE_LOG; + if (tb[NFTA_LOG_LEVEL] != NULL && + tb[NFTA_LOG_GROUP] != NULL) + return -EINVAL; + if (tb[NFTA_LOG_GROUP] != NULL) + li->type = NF_LOG_TYPE_ULOG; nla = tb[NFTA_LOG_PREFIX]; if (nla != NULL) { @@ -63,13 +71,6 @@ static int nft_log_init(const struct nft_ctx *ctx, priv->prefix = (char *)nft_log_null_prefix; } - li->type = NF_LOG_TYPE_LOG; - if (tb[NFTA_LOG_LEVEL] != NULL && - tb[NFTA_LOG_GROUP] != NULL) - return -EINVAL; - if (tb[NFTA_LOG_GROUP] != NULL) - li->type = NF_LOG_TYPE_ULOG; - switch (li->type) { case NF_LOG_TYPE_LOG: if (tb[NFTA_LOG_LEVEL] != NULL) { @@ -96,7 +97,16 @@ static int nft_log_init(const struct nft_ctx *ctx, break; } - return nf_logger_find_get(ctx->afi->family, li->type); + err = nf_logger_find_get(ctx->afi->family, li->type); + if (err < 0) + goto err1; + + return 0; + +err1: + if (priv->prefix != nft_log_null_prefix) + kfree(priv->prefix); + return err; } static void nft_log_destroy(const struct nft_ctx *ctx, |