[PATCH v1 0/2] Fix the possible NULL pointer dereference issue.

[Jiaxin Wu <Jiaxin.wu@intel.com>]

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1456

For the NET_LIST_FOR_EACH & NET_LIST_FOR_EACH_SAFE, "Entry" should be
checked whether it's NULL or not instead of using the pointer directly.

Besides, NET_LIST_FOR_EACH_SAFE is defined to iterate through the double
linked list in delete-safe way. It's unnecessary to use this macro if
list entries won't be deleted.

Cc: Wu Hao A <hao.a.wu@intel.com>
Cc: Gao Liming <liming.gao@intel.com>
Cc: Ye Ting <ting.ye@intel.com>
Cc: Fu Siyuan <siyuan.fu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Wu Jiaxin <jiaxin.wu@intel.com>
Jiaxin Wu (2):
  MdeModulePkg/NetLib.h: Fix the possible NULL pointer dereference issue.
  MdeModulePkg/Dhcp4Dxe: Use NET_LIST_FOR_EACH instead of NET_LIST_FOR_EACH_SAFE.

 MdeModulePkg/Include/Library/NetLib.h             | 6 +++---
 MdeModulePkg/Universal/Network/Dhcp4Dxe/Dhcp4Io.c | 4 ++--
 2 files changed, 5 insertions(+), 5 deletions(-)

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2.17.1.windows.2