[reactos] 01/01: [TCPIP] Check buffer before dereferencing it

[Pierre Schweitzer]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=f76a097a252b52154bdc0…
commit f76a097a252b52154bdc0818a897200e99e2bc29
Author:     Pierre Schweitzer <pierre(a)reactos.org>
AuthorDate: Tue Jan 1 10:45:48 2019 +0100
Commit:     Pierre Schweitzer <pierre(a)reactos.org>
CommitDate: Tue Jan 1 10:45:48 2019 +0100
    [TCPIP] Check buffer before dereferencing it
    CID 716664
---
 drivers/network/tcpip/tcpip/ninfo.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/network/tcpip/tcpip/ninfo.c b/drivers/network/tcpip/tcpip/ninfo.c
index cb88a2110d..5c0952b033 100644
--- a/drivers/network/tcpip/tcpip/ninfo.c
+++ b/drivers/network/tcpip/tcpip/ninfo.c
@@ -312,13 +312,13 @@ TDI_STATUS InfoTdiSetRoute(PIP_INTERFACE IF, PVOID Buffer, UINT
BufferSize)
     IP_ADDRESS Address, Netmask, Router;
     PIPROUTE_ENTRY Route = Buffer;
+    if (!Buffer || BufferSize < sizeof(IPROUTE_ENTRY))
+        return TDI_INVALID_PARAMETER;
+
     AddrInitIPv4( &Address, Route->Dest );
     AddrInitIPv4( &Netmask, Route->Mask );
     AddrInitIPv4( &Router,  Route->Gw );
-    if (!Buffer || BufferSize < sizeof(IPROUTE_ENTRY))
-        return TDI_INVALID_PARAMETER;
-
     if (IF == Loopback)
     {
         DbgPrint("Failing attempt to add route to loopback adapter\n");