Re: [Xen-devel] [PATCH for-xen-4.5] stubdom: another for fix for lwip compile

[Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>]

Olaf Hering, le Tue 07 Oct 2014 16:15:46 +0200, a écrit :
> stubdom/lwip-x86_64/src/core/dhcp.c: In function 'dhcp_create_request':
> stubdom/lwip-x86_64/src/core/dhcp.c:1361:64: error: array subscript is above 
> array bounds
> 
> The previous attempt to fix the failure above worked fine in SLE11,
> openSUSE 13.1 and newer. But gcc-4.5 as included in openSUSE 11.4 still
> failed to compile. To fix compilation also with this version of gcc move
> the range check right into the code instead of assigning it to a
> temporary variable.
> 
> Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>
> Cc: Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>
> Cc: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>

Acked-by: Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>

> ---
>  stubdom/lwip.dhcp_create_request-hwaddr_len.patch | 15 +--------------
>  1 file changed, 1 insertion(+), 14 deletions(-)
> 
> diff --git a/stubdom/lwip.dhcp_create_request-hwaddr_len.patch 
> b/stubdom/lwip.dhcp_create_request-hwaddr_len.patch
> index 12f1014..c43f282 100644
> --- a/stubdom/lwip.dhcp_create_request-hwaddr_len.patch
> +++ b/stubdom/lwip.dhcp_create_request-hwaddr_len.patch
> @@ -1,26 +1,13 @@
> ----
> - lwip-x86_64/src/core/dhcp.c |    4 +++-
> - 1 file changed, 3 insertions(+), 1 deletion(-)
> -
>  Index: src/core/dhcp.c
>  ===================================================================
>  --- src/core/dhcp.c
>  +++ src/core/dhcp.c
> -@@ -1322,6 +1322,8 @@ dhcp_create_request(struct netif *netif)
> - {
> -   struct dhcp *dhcp;
> -   u16_t i;
> -+  /* gcc can not know if hwaddr_len exceeds the hwaddr array size */
> -+  u8_t hwaddr_len = netif->hwaddr_len > NETIF_MAX_HWADDR_LEN ? 
> NETIF_MAX_HWADDR_LEN : netif->hwaddr_len;
> -   LWIP_ERROR("dhcp_create_request: netif != NULL", (netif != NULL), return 
> ERR_ARG;);
> -   dhcp = netif->dhcp;
> -   LWIP_ERROR("dhcp_create_request: dhcp != NULL", (dhcp != NULL), return 
> ERR_VAL;);
>  @@ -1356,7 +1358,7 @@ dhcp_create_request(struct netif *netif)
>     dhcp->msg_out->giaddr.addr = 0;
>     for (i = 0; i < DHCP_CHADDR_LEN; i++) {
>       /* copy netif hardware address, pad with zeroes */
>  -    dhcp->msg_out->chaddr[i] = (i < netif->hwaddr_len) ? netif->hwaddr[i] : 
> 0/* pad byte*/;
> -+    dhcp->msg_out->chaddr[i] = (i < hwaddr_len) ? netif->hwaddr[i] : 0/* 
> pad byte*/;
> ++    dhcp->msg_out->chaddr[i] = (i < (netif->hwaddr_len > 
> NETIF_MAX_HWADDR_LEN ? NETIF_MAX_HWADDR_LEN : netif->hwaddr_len)) ? 
> netif->hwaddr[i] : 0/* pad byte*/;
>     }
>     for (i = 0; i < DHCP_SNAME_LEN; i++) {
>       dhcp->msg_out->sname[i] = 0;
> 

-- 
Samuel
Running Windows on a Pentium is like having a brand new Porsche but only
be able to drive backwards with the handbrake on.
(Unknown source)

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