On 26.01.2016 02:58, Jeff Kirsher wrote:
> From: Arnd Bergmann <a...@arndb.de>
>
> intel/i40e/i40e_txrx.c: In function 'i40e_xmit_frame_ring':
> intel/i40e/i40e_txrx.c:2367:20: error: 'oiph' may be used uninitialized in
> this function [-Werror=maybe-uninitialized]
> intel/i40e/i40e_txrx.c:2317:16: note: 'oiph' was declared here
> intel/i40e/i40e_txrx.c:2367:17: error: 'oudph' may be used uninitialized in
> this function [-Werror=maybe-uninitialized]
> intel/i40e/i40e_txrx.c:2316:17: note: 'oudph' was declared here
2364 if ((tx_ring->flags & I40E_TXR_FLAGS_OUTER_UDP_CSUM) &&
2365 (l4_tunnel == I40E_TXD_CTX_UDP_TUNNELING) &&
2366 (*cd_tunneling & I40E_TXD_CTX_QW0_EXT_IP_MASK)) {
2367 oudph->check = ~csum_tcpudp_magic(oiph->saddr,
2368 oiph->daddr,
2369 (skb->len -
skb_transport_offset(skb)),
2370 IPPROTO_UDP, 0);
if compiler reports that oudph and oiph can be unitialized here,
it's not enough just to set them to NULL.
Do we need probably to check that variables was initialized before access here?
i.e. add oudph && oiph into condition?
> Signed-off-by: Arnd Bergmann <a...@arndb.de>
> Tested-by: Andrew Bowers <andrewx.bow...@intel.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirs...@intel.com>
> ---
> drivers/net/ethernet/intel/i40e/i40e_txrx.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
> b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
> index 720516b..47bd8b3 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
> @@ -2313,8 +2313,8 @@ static void i40e_tx_enable_csum(struct sk_buff *skb,
> u32 *tx_flags,
> struct iphdr *this_ip_hdr;
> u32 network_hdr_len;
> u8 l4_hdr = 0;
> - struct udphdr *oudph;
> - struct iphdr *oiph;
> + struct udphdr *oudph = NULL;
> + struct iphdr *oiph = NULL;
> u32 l4_tunnel = 0;
>
> if (skb->encapsulation) {
>
