Add more check to make code more safely.
Signed-off-by: Eric Dong <eric.dong@intel.com> Reviewed-by: Ouyang Qian <ouyang.qian@intel.com> git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13903 6f19259b-4bc3-4df7-8a09-765794883524
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@@ -240,6 +240,7 @@ Ip4IcmpReplyEcho (
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// update is omitted.
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//
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Icmp = (IP4_ICMP_QUERY_HEAD *) NetbufGetByte (Data, 0, NULL);
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ASSERT (Icmp != NULL);
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Icmp->Head.Type = ICMP_ECHO_REPLY;
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Icmp->Head.Checksum = 0;
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Icmp->Head.Checksum = (UINT16) (~NetblockChecksum ((UINT8 *) Icmp, Data->TotalSize));
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