On Wed, Mar 21, 2018 at 12:34 PM, Colin King <colin.king@xxxxxxxxxxxxx> wrote:
> From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
>
> The current logic of flags | TUNNEL_SEQ is always non-zero and hence
> sequence numbers are always incremented no matter the setting of the
> TUNNEL_SEQ bit. Fix this by using & instead of |.
>
> Detected by CoverityScan, CID#1466039 ("Operands don't affect result")
>
> Fixes: 77a5196a804e ("gre: add sequence number for collect md mode.")
> Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
Thanks for the fix!
btw, how can I access the CoverityScan result with this CID?
Acked-by: William Tu <u9012063@xxxxxxxxx>
> ---
> net/ipv4/ip_gre.c | 2 +-
> net/ipv6/ip6_gre.c | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
> index 2fa2ef2e2af9..9ab1aa2f7660 100644
> --- a/net/ipv4/ip_gre.c
> +++ b/net/ipv4/ip_gre.c
> @@ -550,7 +550,7 @@ static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev,
> (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
> gre_build_header(skb, tunnel_hlen, flags, proto,
> tunnel_id_to_key32(tun_info->key.tun_id),
> - (flags | TUNNEL_SEQ) ? htonl(tunnel->o_seqno++) : 0);
> + (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++) : 0);
>
> df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
>
> diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
> index 0bcefc480aeb..3a98c694da5f 100644
> --- a/net/ipv6/ip6_gre.c
> +++ b/net/ipv6/ip6_gre.c
> @@ -725,7 +725,7 @@ static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
> gre_build_header(skb, tunnel->tun_hlen,
> flags, protocol,
> tunnel_id_to_key32(tun_info->key.tun_id),
> - (flags | TUNNEL_SEQ) ? htonl(tunnel->o_seqno++)
> + (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++)
> : 0);
>
> } else {
> --
> 2.15.1
>
--
To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
