Stefan Dösinger : iphlpapi: Write an ERR if the sockaddr parsing went wrong.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 7f4beb0883172a1629926e070fc6d5b6fab05922
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=7f4beb0883172a1629926e070...

Author: Stefan Dösinger 
Date:   Sun Apr 12 14:24:55 2020 +0200

iphlpapi: Write an ERR if the sockaddr parsing went wrong.

It should not happen any more after the previous patch but it is subtle
enough that I think being verbose about it makes sense.

Signed-off-by: Stefan Dösinger 
Signed-off-by: Alexandre Julliard

---

dlls/iphlpapi/ipstats.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/dlls/iphlpapi/ipstats.c b/dlls/iphlpapi/ipstats.c
index 6986a4b315..9d6a84dd33 100644
--- a/dlls/iphlpapi/ipstats.c
+++ b/dlls/iphlpapi/ipstats.c
@@ -1539,6 +1539,12 @@ DWORD WINAPI AllocateAndGetIpForwardTableFromStack(PMIB_IPFORWARDTABLE *ppIpForw
                 continue;

sa = (struct sockaddr *)addrPtr;
+             if (addrPtr + sa->sa_len > next + rtm->rtm_msglen)
+             {
+                ERR ("struct sockaddr extends beyond the route message, %p > %p\n",
+                   addrPtr + sa->sa_len, next + rtm->rtm_msglen );
+             }
+
              ADVANCE (addrPtr, sa);

/* default routes are encoded by length-zero sockaddr */