Multiple integer overflows in dbe and render extensions

CVE IDs: CVE-2006-6101 CVE-2006-6102 CVE-2006-6103

1 files changed, 22 insertions, 12 deletions

diff --git a/dbe/dbe.c b/dbe/dbe.c
index 38375f92a..862393b53 100644
--- a/dbe/dbe.c
+++ b/dbe/dbe.c
@@ -39,6 +39,11 @@
 #endif
 
 #include <string.h>
+#if HAVE_STDINT_H
+#include <stdint.h>
+#elif !defined(UINT32_MAX)
+#define UINT32_MAX 0xffffffffU
+#endif
 
 #include <X11/X.h>
 #include <X11/Xproto.h>
@@ -711,11 +716,14 @@ ProcDbeSwapBuffers(ClientPtr client)
         return(Success);
     }
 
+    if (nStuff > UINT32_MAX / sizeof(DbeSwapInfoRec))
+	    return BadAlloc;
+
     /* Get to the swap info appended to the end of the request. */
     dbeSwapInfo = (xDbeSwapInfo *)&stuff[1];
 
     /* Allocate array to record swap information. */ 
-    swapInfo = (DbeSwapInfoPtr)ALLOCATE_LOCAL(nStuff * sizeof(DbeSwapInfoRec));
+    swapInfo = (DbeSwapInfoPtr)Xalloc(nStuff * sizeof(DbeSwapInfoRec));
     if (swapInfo == NULL)
     {
         return(BadAlloc);
@@ -730,14 +738,14 @@ ProcDbeSwapBuffers(ClientPtr client)
 	error = dixLookupWindow(&pWin, dbeSwapInfo[i].window, client,
 				DixWriteAccess);
 	if (error != Success) {
-            DEALLOCATE_LOCAL(swapInfo);
+            Xfree(swapInfo);
 	    return error;
         }
 
         /* Each window must be double-buffered - BadMatch. */
         if (DBE_WINDOW_PRIV(pWin) == NULL)
         {
-            DEALLOCATE_LOCAL(swapInfo);
+            Xfree(swapInfo);
             return(BadMatch);
         }
 
@@ -746,7 +754,7 @@ ProcDbeSwapBuffers(ClientPtr client)
         {
             if (dbeSwapInfo[i].window == dbeSwapInfo[j].window)
             {
-                DEALLOCATE_LOCAL(swapInfo);
+                Xfree(swapInfo);
                 return(BadMatch);
 	    }
         }
@@ -757,7 +765,7 @@ ProcDbeSwapBuffers(ClientPtr client)
             (dbeSwapInfo[i].swapAction != XdbeUntouched ) &&
             (dbeSwapInfo[i].swapAction != XdbeCopied    ))
         {
-            DEALLOCATE_LOCAL(swapInfo);
+            Xfree(swapInfo);
             return(BadValue);
         }
 
@@ -787,12 +795,12 @@ ProcDbeSwapBuffers(ClientPtr client)
         error = (*pDbeScreenPriv->SwapBuffers)(client, &nStuff, swapInfo);
         if (error != Success)
         {
-            DEALLOCATE_LOCAL(swapInfo);
+            Xfree(swapInfo);
             return(error);
         }
     }
     
-    DEALLOCATE_LOCAL(swapInfo);
+    Xfree(swapInfo);
     return(Success);
 
 } /* ProcDbeSwapBuffers() */
@@ -874,10 +882,12 @@ ProcDbeGetVisualInfo(ClientPtr client)
 
     REQUEST_AT_LEAST_SIZE(xDbeGetVisualInfoReq);
 
+    if (stuff->n > UINT32_MAX / sizeof(DrawablePtr))
+	    return BadAlloc;
     /* Make sure any specified drawables are valid. */
     if (stuff->n != 0)
     {
-        if (!(pDrawables = (DrawablePtr *)ALLOCATE_LOCAL(stuff->n *
+        if (!(pDrawables = (DrawablePtr *)Xalloc(stuff->n *
                                                  sizeof(DrawablePtr))))
         {
             return(BadAlloc);
@@ -890,7 +900,7 @@ ProcDbeGetVisualInfo(ClientPtr client)
 	    rc = dixLookupDrawable(pDrawables+i, drawables[i], client, 0,
 				   DixReadAccess);
 	    if (rc != Success) {
-                DEALLOCATE_LOCAL(pDrawables);
+                Xfree(pDrawables);
                 return rc;
             }
         }
@@ -902,7 +912,7 @@ ProcDbeGetVisualInfo(ClientPtr client)
     {
         if (pDrawables)
         {
-            DEALLOCATE_LOCAL(pDrawables);
+            Xfree(pDrawables);
         }
 
         return(BadAlloc);
@@ -929,7 +939,7 @@ ProcDbeGetVisualInfo(ClientPtr client)
             /* Free pDrawables if we needed to allocate it above. */
             if (pDrawables)
             {
-                DEALLOCATE_LOCAL(pDrawables);
+                Xfree(pDrawables);
             }
 
             return(BadAlloc);
@@ -1010,7 +1020,7 @@ ProcDbeGetVisualInfo(ClientPtr client)
 
     if (pDrawables)
     {
-        DEALLOCATE_LOCAL(pDrawables);
+        Xfree(pDrawables);
     }
 
     return(client->noClientException);