[reactos] 01/01: [TRACERT] Fix undefined behavior by fixing ReplyBuffer size. (#2422)

[Erdem Ersoy]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=0ddf0a06c35ce39f330564...

commit 0ddf0a06c35ce39f330564f896d45611731bb74b
Author:     Erdem Ersoy [e-mail]
AuthorDate: Sun Mar 8 21:36:07 2020 +0300
Commit:     GitHub [e-mail]
CommitDate: Sun Mar 8 19:36:07 2020 +0100

[TRACERT] Fix undefined behavior by fixing ReplyBuffer size. (#2422)

CORE-16620
---
 base/applications/network/tracert/tracert.cpp | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/base/applications/network/tracert/tracert.cpp b/base/applications/network/tracert/tracert.cpp
index da026a65d00..1cabd0a2dd0 100644
--- a/base/applications/network/tracert/tracert.cpp
+++ b/base/applications/network/tracert/tracert.cpp
@@ -377,31 +377,31 @@ RunTraceRoute()
     }

BYTE SendBuffer[PACKET_SIZE];
-    ICMPV6_ECHO_REPLY ReplyBufferv6;
-#ifdef _WIN64
-    ICMP_ECHO_REPLY32 ReplyBufferv432;
-#else
-    ICMP_ECHO_REPLY ReplyBufferv4;
-#endif
+
     PVOID ReplyBuffer;

DWORD ReplySize = PACKET_SIZE + SIZEOF_ICMP_ERROR + SIZEOF_IO_STATUS_BLOCK;
     if (Info.Family == AF_INET6)
     {
-        ReplyBuffer = &ReplyBufferv6;
         ReplySize += sizeof(ICMPV6_ECHO_REPLY);
     }
     else
     {
 #ifdef _WIN64
-        ReplyBuffer = &ReplyBufferv432;
         ReplySize += sizeof(ICMP_ECHO_REPLY32);
 #else
-        ReplyBuffer = &ReplyBufferv4;
         ReplySize += sizeof(ICMP_ECHO_REPLY);
 #endif
     }

+    HANDLE heap = GetProcessHeap();
+    ReplyBuffer = HeapAlloc(heap, HEAP_ZERO_MEMORY, ReplySize);
+    if (ReplyBuffer == NULL)
+    {
+        FreeAddrInfoW(Info.Target);
+        return false;
+    }
+
     if (Info.Family == AF_INET6)
     {
         Info.hIcmpFile = Icmp6CreateFile();
@@ -412,6 +412,7 @@ RunTraceRoute()
     }
     if (Info.hIcmpFile == INVALID_HANDLE_VALUE)
     {
+        HeapFree(heap, 0, ReplyBuffer);
         FreeAddrInfoW(Info.Target);
         return false;
     }
@@ -486,6 +487,7 @@ RunTraceRoute()

OutputText(IDS_TRACE_COMPLETE);

+    HeapFree(heap, 0, ReplyBuffer);
     FreeAddrInfoW(Info.Target);
     if (Info.hIcmpFile)
     {