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NetworkPkg: Check for the max DHCP packet length before use it.

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This patch updates the PXE and HTTP boot driver to drop the input DHCP packet
if it exceed the maximum length.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Fu Siyuan <siyuan.fu@intel.com>
Reviewed-By: Wu Jiaxin <jiaxin.wu@intel.com>
This commit is contained in:
Fu Siyuan
2016-11-16 13:37:15 +08:00
parent 4f6b33b460
commit 632dcfd685
9 changed files with 91 additions and 18 deletions
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6
NetworkPkg/UefiPxeBcDxe/PxeBcDhcp4.h
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@@ -18,7 +18,7 @@
#define PXEBC_DHCP4_OPTION_MAX_NUM 16
#define PXEBC_DHCP4_OPTION_MAX_SIZE 312
#define PXEBC_DHCP4_PACKET_MAX_SIZE 1472
#define PXEBC_DHCP4_PACKET_MAX_SIZE (sizeof (EFI_PXE_BASE_CODE_PACKET))
#define PXEBC_DHCP4_S_PORT 67
#define PXEBC_DHCP4_C_PORT 68
#define PXEBC_BS_DOWNLOAD_PORT 69
@@ -263,10 +263,12 @@ typedef struct {
UINT8 CredTypeLen;
} PXEBC_VENDOR_OPTION;
#define PXEBC_CACHED_DHCP4_PACKET_MAX_SIZE (OFFSET_OF (EFI_DHCP4_PACKET, Dhcp4) + PXEBC_DHCP4_PACKET_MAX_SIZE)
typedef union {
EFI_DHCP4_PACKET Offer;
EFI_DHCP4_PACKET Ack;
UINT8 Buffer[PXEBC_DHCP4_PACKET_MAX_SIZE];
UINT8 Buffer[PXEBC_CACHED_DHCP4_PACKET_MAX_SIZE];
} PXEBC_DHCP4_PACKET;
typedef struct {