netdev - [PATCH net-next] team: fix releasing uninitialized pointer to BPF prog

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Message-Id: <1406836139-11943-1-git-send-email-dborkman@redhat.com>
Date:	Thu, 31 Jul 2014 21:48:59 +0200
From:	Daniel Borkmann <dborkman@...hat.com>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org, Pablo Neira <pablo@...filter.org>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Jiri Pirko <jiri@...nulli.us>
Subject: [PATCH net-next] team: fix releasing uninitialized pointer to BPF prog

Commit 34c5bd66e5ed introduced the possibility that an
uninitialized pointer on the stack (orig_fp) can call into
sk_unattached_filter_destroy() when its value is non NULL.

Before that commit orig_fp was only destroyed in the same
block where it was assigned a valid BPF prog before. Fix it
up by initializing it to NULL.

Fixes: 34c5bd66e5ed ("net: filter: don't release unattached filter through call_rcu()")
Signed-off-by: Daniel Borkmann <dborkman@...hat.com>
Cc: Pablo Neira <pablo@...filter.org>
Cc: Alexei Starovoitov <ast@...mgrid.com>
Cc: Jiri Pirko <jiri@...nulli.us>
---
 drivers/net/team/team_mode_loadbalance.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/team/team_mode_loadbalance.c b/drivers/net/team/team_mode_loadbalance.c
index 7106f34..d7be9b3 100644
--- a/drivers/net/team/team_mode_loadbalance.c
+++ b/drivers/net/team/team_mode_loadbalance.c
@@ -272,7 +272,7 @@ static int lb_bpf_func_set(struct team *team, struct team_gsetter_ctx *ctx)
 {
 	struct lb_priv *lb_priv = get_lb_priv(team);
 	struct sk_filter *fp = NULL;
-	struct sk_filter *orig_fp;
+	struct sk_filter *orig_fp = NULL;
 	struct sock_fprog_kern *fprog = NULL;
 	int err;
 
-- 
1.9.0

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