Marcus Meissner : user32: Fixed two use-after-free (Coverity).

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 84bb5969120d605ec0f6bbe458851cba4670edaa
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=84bb5969120d605ec0f6bbe458851cba4670edaa

Author: Marcus Meissner <marcus at jet.franken.de>
Date:   Fri Aug 17 21:31:34 2012 +0200

user32: Fixed two use-after-free (Coverity).

---

 dlls/user32/dde_client.c |   15 +++++++++++----
 1 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/dlls/user32/dde_client.c b/dlls/user32/dde_client.c
index ef3ee3f..90fa4db 100644
--- a/dlls/user32/dde_client.c
+++ b/dlls/user32/dde_client.c
@@ -1246,14 +1246,18 @@ BOOL WINAPI DdeAbandonTransaction(DWORD idInst, HCONV hConv, DWORD idTransaction
         {
             if ((pConv = WDML_GetConv(hConv, TRUE)) && pConv->instance == pInstance)
             {
-                for (pXAct = pConv->transactions; pXAct; pXAct = pXAct->next)
-                {
+
+                pXAct = pConv->transactions;
+                while (pXAct) {
+                    WDML_XACT *nextXAct = pXAct->next;
+
                     if (pXAct->dwTimeout == TIMEOUT_ASYNC &&
                         (idTransaction == 0 || pXAct->xActID == idTransaction))
                     {
                         WDML_UnQueueTransaction(pConv, pXAct);
                         WDML_FreeTransaction(pInstance, pXAct, TRUE);
                     }
+                    pXAct = nextXAct;
                 }
             }
         }
@@ -1262,13 +1266,16 @@ BOOL WINAPI DdeAbandonTransaction(DWORD idInst, HCONV hConv, DWORD idTransaction
             for (pConv = pInstance->convs[WDML_CLIENT_SIDE]; pConv; pConv = pConv->next)
             {
                 if (!(pConv->wStatus & ST_CONNECTED)) continue;
-                for (pXAct = pConv->transactions; pXAct; pXAct = pXAct->next)
-                {
+                pXAct = pConv->transactions;
+                while (pXAct) {
+                    WDML_XACT *nextXAct = pXAct->next;
+
                     if (pXAct->dwTimeout == TIMEOUT_ASYNC)
                     {
                         WDML_UnQueueTransaction(pConv, pXAct);
                         WDML_FreeTransaction(pInstance, pXAct, TRUE);
                     }
+                    pXAct = nextXAct;
                 }
             }
         }