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MdeModulePkg: Ignore BootFileName if it is overloaded.

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Make sure "BootFileName" is not overloaded before use it in PXE driver.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: chenzhihui <chenzhihui4@huawei.com>
Signed-off-by: Heyi Guo <heyi.guo@linaro.org>
Reviewed-by: Fu Siyuan <siyuan.fu@intel.com>
This commit is contained in:
Heyi Guo 2016-04-23 15:01:16 +08:00 committed by Fu Siyuan
parent a1522257a9
commit 61e0f079bc
1 changed files with 7 additions and 3 deletions
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10
MdeModulePkg/Universal/Network/UefiPxeBcDxe/PxeBcDhcp.c
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@ -2,7 +2,7 @@
Support for PxeBc dhcp functions.
Copyright (c) 2013, Red Hat, Inc.
Copyright (c) 2007 - 2015, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2007 - 2016, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
@ -228,9 +228,13 @@ PxeBcParseCachedDhcpPacket (
// If the bootfile is not present and bootfilename is present in dhcp packet, just parse it.
// And do not count dhcp option header, or else will destroy the serverhostname.
//
Options[PXEBC_DHCP4_TAG_INDEX_BOOTFILE] = (EFI_DHCP4_PACKET_OPTION *) (&Offer->Dhcp4.Header.BootFileName[0] -
// Make sure "BootFileName" is not overloaded.
//
if (Options[PXEBC_DHCP4_TAG_INDEX_OVERLOAD] == NULL ||
(Options[PXEBC_DHCP4_TAG_INDEX_OVERLOAD]->Data[0] & PXEBC_DHCP4_OVERLOAD_FILE) == 0) {
Options[PXEBC_DHCP4_TAG_INDEX_BOOTFILE] = (EFI_DHCP4_PACKET_OPTION *) (&Offer->Dhcp4.Header.BootFileName[0] -
OFFSET_OF (EFI_DHCP4_PACKET_OPTION, Data[0]));
}
}
//