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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>
This commit is contained in:
Liping Zhang 2016-07-18 20:44:15 +08:00 committed by Pablo Neira Ayuso
parent 82de0be686
commit c2d9a4293c
1 changed files with 18 additions and 8 deletions
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26
net/netfilter/nft_log.c
View File

@ -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,