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Date: Mon, 7 Dec 2015 10:00:29 -0500 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Pravin B Shelar <pshelar@...ira.com>, Tobias Klauser <tklauser@...tanz.ch>, "David S. Miller" <davem@...emloft.net> Subject: [PATCH 4.3 016/125] tun_dst: Fix potential NULL dereference 4.3-stable review patch. If anyone has any objections, please let me know. ------------------ From: Tobias Klauser <tklauser@...tanz.ch> [ 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 <pshelar@...ira.com> Signed-off-by: Tobias Klauser <tklauser@...tanz.ch> Signed-off-by: David S. Miller <davem@...emloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- 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); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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