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[efi] Check for presence of UNDI in NII protocol

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iPXE itself exposes a dummy NII protocol with no UNDI.  Avoid
potentially dereferencing a NULL pointer by checking for a non-zero
UNDI address.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2014-10-17 16:50:45 +01:00
parent 047baaba38
commit feb3a0f7d5
1 changed files with 6 additions and 0 deletions
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6
src/drivers/net/efi/nii.c
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@ -1037,6 +1037,11 @@ static int nii_start ( struct efi_device *efidev ) {
/* Locate UNDI and entry point */
nii->undi = ( ( void * ) ( intptr_t ) nii->nii->Id );
if ( ! nii->undi ) {
DBGC ( nii, "NII %s has no UNDI\n", nii->dev.name );
rc = -ENODEV;
goto err_no_undi;
}
if ( nii->undi->Implementation & PXE_ROMID_IMP_HW_UNDI ) {
DBGC ( nii, "NII %s is a mythical hardware UNDI\n",
nii->dev.name );
@ -1085,6 +1090,7 @@ static int nii_start ( struct efi_device *efidev ) {
nii_pci_close ( nii );
err_pci_open:
err_hw_undi:
err_no_undi:
bs->CloseProtocol ( device, &efi_nii31_protocol_guid,
efi_image_handle, device );
err_open_protocol: