From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Pravin B Shelar , Tobias Klauser , "David S. Miller" Subject: [PATCH 4.3 016/125] tun_dst: Fix potential NULL dereference Date: Mon, 7 Dec 2015 10:00:29 -0500 Message-Id: <20151207145753.043505819@linuxfoundation.org> In-Reply-To: <20151207145752.225938417@linuxfoundation.org> References: <20151207145752.225938417@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Sender: linux-kernel-owner@vger.kernel.org List-ID: 4.3-stable review patch. If anyone has any objections, please let me know. ------------------ From: Tobias Klauser [ Upstream commit f63ce5b6fa5e9a0faf7a0e1ef2993a502878c78a ] In tun_dst_unclone() the return value of skb_metadata_dst() is checked for being NULL after it is dereferenced. Fix this by moving the dereference after the NULL check. Found by the Coverity scanner (CID 1338068). Fixes: fc4099f17240 ("openvswitch: Fix egress tunnel info.") Cc: Pravin B Shelar Signed-off-by: Tobias Klauser Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- include/net/dst_metadata.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/include/net/dst_metadata.h +++ b/include/net/dst_metadata.h @@ -63,12 +63,13 @@ static inline struct metadata_dst *tun_r static inline struct metadata_dst *tun_dst_unclone(struct sk_buff *skb) { struct metadata_dst *md_dst = skb_metadata_dst(skb); - int md_size = md_dst->u.tun_info.options_len; + int md_size; struct metadata_dst *new_md; if (!md_dst) return ERR_PTR(-EINVAL); + md_size = md_dst->u.tun_info.options_len; new_md = metadata_dst_alloc(md_size, GFP_ATOMIC); if (!new_md) return ERR_PTR(-ENOMEM);