NetworkPkg: Code logic optimization for DnsDxe and HttpDxe driver

Revise some errors which may lead NULL pointer be dereferenced:
* DnsDhcp.c: Paralist may be used without any initialized
* DnsHeader and RcvString may be null but be dereferenced
* HttpDriver.c: revise an if judgment
* HttpImpl.c: add a judgment to avoid null dereferenced

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: fanwang2 <fan.wang@intel.com>
Reviewed-by: Ye Ting <ting.ye@intel.com>
Reviewed-by: Jiaxin Wu <jiaxin.wu@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17923 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
fanwang2
2015-07-10 09:00:33 +00:00
committed by fanwang2
parent 6b6fe3e9aa
commit 3fd7bd08f4
4 changed files with 10 additions and 2 deletions

View File

@@ -1049,6 +1049,7 @@ IsValidDnsResponse (
continue;
} else {
TxString = NetbufGetByte (Packet, 0, NULL);
ASSERT (TxString != NULL);
DnsHeader = (DNS_HEADER *) TxString;
QueryName = (CHAR8 *) (TxString + sizeof (*DnsHeader));
QuerySection = (DNS_QUERY_SECTION *) (QueryName + AsciiStrLen (QueryName) + 1);
@@ -1426,7 +1427,8 @@ DnsOnPacketReceived (
ASSERT (Packet != NULL);
RcvString = NetbufGetByte (Packet, 0, NULL);
ASSERT (RcvString != NULL);
//
// Parse Dns Response
//