[pxe] Always allow MAX_LL_HEADER_LEN for the link-layer header

Signed-off-by: Michael Brown <mcb30@ipxe.org>

diff --git a/src/arch/i386/interface/pxe/pxe_undi.c b/src/arch/i386/interface/pxe/pxe_undi.c
index 3ebee94e1797afcc97a8860e4d7ec0be49e0985e..27f3c801a8be965db77309d3edb4495bfe49396b 100644 (file)
--- a/src/arch/i386/interface/pxe/pxe_undi.c
+++ b/src/arch/i386/interface/pxe/pxe_undi.c
@@ -228,7 +228,6 @@ PXENV_EXIT_t pxenv_undi_transmit ( struct s_PXENV_UNDI_TRANSMIT
        struct ll_protocol *ll_protocol = pxe_netdev->ll_protocol;
        char destaddr[MAX_LL_ADDR_LEN];
        const void *ll_dest;
-       size_t ll_hlen = ll_protocol->ll_header_len;
        size_t len;
        unsigned int i;
        int rc;
@@ -248,7 +247,6 @@ PXENV_EXIT_t pxenv_undi_transmit ( struct s_PXENV_UNDI_TRANSMIT
        case P_RARP:    net_protocol = &rarp_protocol;  break;
        case P_UNKNOWN:
                net_protocol = NULL;
-               ll_hlen = 0;
                break;
        default:
                DBG2 ( " %02x invalid protocol\n", undi_transmit->Protocol );
@@ -271,13 +269,13 @@ PXENV_EXIT_t pxenv_undi_transmit ( struct s_PXENV_UNDI_TRANSMIT
        }
 
        /* Allocate and fill I/O buffer */
-       iobuf = alloc_iob ( ll_hlen + len );
+       iobuf = alloc_iob ( MAX_LL_HEADER_LEN + len );
        if ( ! iobuf ) {
                DBG2 ( " could not allocate iobuf\n" );
                undi_transmit->Status = PXENV_STATUS_OUT_OF_RESOURCES;
                return PXENV_EXIT_FAILURE;
        }
-       iob_reserve ( iobuf, ll_hlen );
+       iob_reserve ( iobuf, MAX_LL_HEADER_LEN );
        copy_from_real ( iob_put ( iobuf, tbd.ImmedLength ), tbd.Xmit.segment,
                         tbd.Xmit.offset, tbd.ImmedLength );
        for ( i = 0 ; i < tbd.DataBlkCount ; i++ ) {