Changeset 4934 in vbox

Timestamp:

Sep 20, 2007 2:31:27 PM (17 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

24682

Message:

Bugfix.

File:

• trunk/src/VBox/Devices/Network/DrvTAPOs2.cpp (modified) (3 diffs)

trunk/src/VBox/Devices/Network/DrvTAPOs2.cpp

@@ -27 +27 @@
 #include <iprt/string.h>
 #include <iprt/thread.h>
+#include <iprt/alloca.h>
 #include <iprt/asm.h>
 #include <iprt/semaphore.h>
@@ -118 +119 @@
     STAM_PROFILE_START(&pThis->StatTransmit, a);
 
+    /* 
+     * If the pvBuf is a high address, we'll have to copy it onto a 
+     * stack buffer of the tap driver will trap.
+     */
+    if ((uintptr_t)pvBuf >= _1M*512)
+    {
+        void *pvBufCopy = alloca(cb);
+        memcpy(pvBufCopy, pvBuf, cb);
+        pvBuf = pvBufCopy;
+    }
+
 #ifdef LOG_ENABLED
     uint64_t u64Now = RTTimeProgramNanoTS();
@@ -123 +135 @@
              cb, u64Now, u64Now - pThis->u64LastReceiveTS, u64Now - pThis->u64LastTransferTS));
     pThis->u64LastTransferTS = u64Now;
-#endif
     Log2(("%s Send: pvBuf=%p cb=%#zx\n"
           "%.*Vhxd\n",
           pThis->szName, pvBuf, cb, cb, pvBuf));
+#endif
 
     ULONG Parm[2] = { ~0UL, ~0UL }; /* mysterious output */