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

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2010-11-19 15:32:05 +00:00
parent 1782fc7011
commit 308615cd97
1 changed files with 4 additions and 1 deletions
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5
src/interface/efi/efi_snp.c
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@ -530,6 +530,7 @@ efi_snp_transmit ( EFI_SIMPLE_NETWORK_PROTOCOL *snp,
container_of ( snp, struct efi_snp_device, snp );
struct ll_protocol *ll_protocol = snpdev->netdev->ll_protocol;
struct io_buffer *iobuf;
size_t ll_headroom;
int rc;
EFI_STATUS efirc;
@ -582,13 +583,15 @@ efi_snp_transmit ( EFI_SIMPLE_NETWORK_PROTOCOL *snp,
}
/* Allocate buffer */
iobuf = alloc_iob ( len );
ll_headroom = ( MAX_LL_HEADER_LEN - ll_header_len );
iobuf = alloc_iob ( ll_headroom + len );
if ( ! iobuf ) {
DBGC ( snpdev, "SNPDEV %p TX could not allocate %ld-byte "
"buffer\n", snpdev, ( ( unsigned long ) len ) );
efirc = EFI_DEVICE_ERROR;
goto err_alloc_iob;
}
iob_reserve ( iobuf, ll_headroom );
memcpy ( iob_put ( iobuf, len ), data, len );
/* Create link-layer header, if specified */