Fix CVE-2014-8091..8103. Patches were ported from Ubuntu 14.04 (xorg-server 1.15.1)

1 files changed, 18 insertions, 5 deletions

diff --git a/xorg-server/glx/single2.c b/xorg-server/glx/single2.c
index 8d4d1d061..cd3593295 100644
--- a/xorg-server/glx/single2.c
+++ b/xorg-server/glx/single2.c
@@ -48,11 +48,14 @@
 int
 __glXDisp_FeedbackBuffer(__GLXclientState * cl, GLbyte * pc)
 {
+    ClientPtr client = cl->client;
     GLsizei size;
     GLenum type;
     __GLXcontext *cx;
     int error;
 
+    REQUEST_FIXED_SIZE(xGLXSingleReq, 8);
+
     cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
     if (!cx) {
         return error;
@@ -79,10 +82,13 @@ __glXDisp_FeedbackBuffer(__GLXclientState * cl, GLbyte * pc)
 int
 __glXDisp_SelectBuffer(__GLXclientState * cl, GLbyte * pc)
 {
+    ClientPtr client = cl->client;
     __GLXcontext *cx;
     GLsizei size;
     int error;
 
+    REQUEST_FIXED_SIZE(xGLXSingleReq, 4);
+
     cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
     if (!cx) {
         return error;
@@ -107,7 +113,7 @@ __glXDisp_SelectBuffer(__GLXclientState * cl, GLbyte * pc)
 int
 __glXDisp_RenderMode(__GLXclientState * cl, GLbyte * pc)
 {
-    ClientPtr client;
+    ClientPtr client = cl->client;
     xGLXRenderModeReply reply;
     __GLXcontext *cx;
     GLint nitems = 0, retBytes = 0, retval, newModeCheck;
@@ -115,6 +121,8 @@ __glXDisp_RenderMode(__GLXclientState * cl, GLbyte * pc)
     GLenum newMode;
     int error;
 
+    REQUEST_FIXED_SIZE(xGLXSingleReq, 4);
+
     cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
     if (!cx) {
         return error;
@@ -191,7 +199,6 @@ __glXDisp_RenderMode(__GLXclientState * cl, GLbyte * pc)
      ** selection array, as per the API for glRenderMode itself.
      */
  noChangeAllowed:;
-    client = cl->client;
     reply = (xGLXRenderModeReply) {
         .type = X_Reply,
         .sequenceNumber = client->sequence,
@@ -210,9 +217,12 @@ __glXDisp_RenderMode(__GLXclientState * cl, GLbyte * pc)
 int
 __glXDisp_Flush(__GLXclientState * cl, GLbyte * pc)
 {
+    ClientPtr client = cl->client;
     __GLXcontext *cx;
     int error;
 
+    REQUEST_SIZE_MATCH(xGLXSingleReq);
+
     cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
     if (!cx) {
         return error;
@@ -226,10 +236,12 @@ __glXDisp_Flush(__GLXclientState * cl, GLbyte * pc)
 int
 __glXDisp_Finish(__GLXclientState * cl, GLbyte * pc)
 {
+    ClientPtr client = cl->client;
     __GLXcontext *cx;
-    ClientPtr client;
     int error;
 
+    REQUEST_SIZE_MATCH(xGLXSingleReq);
+
     cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
     if (!cx) {
         return error;
@@ -320,7 +332,7 @@ __glXcombine_strings(const char *cext_string, const char *sext_string)
 int
 DoGetString(__GLXclientState * cl, GLbyte * pc, GLboolean need_swap)
 {
-    ClientPtr client;
+    ClientPtr client = cl->client;
     __GLXcontext *cx;
     GLenum name;
     const char *string;
@@ -330,6 +342,8 @@ DoGetString(__GLXclientState * cl, GLbyte * pc, GLboolean need_swap)
     char *buf = NULL, *buf1 = NULL;
     GLint length = 0;
 
+    REQUEST_FIXED_SIZE(xGLXSingleReq, 4);
+
     /* If the client has the opposite byte order, swap the contextTag and
      * the name.
      */
@@ -346,7 +360,6 @@ DoGetString(__GLXclientState * cl, GLbyte * pc, GLboolean need_swap)
     pc += __GLX_SINGLE_HDR_SIZE;
     name = *(GLenum *) (pc + 0);
     string = (const char *) glGetString(name);
-    client = cl->client;
 
     if (string == NULL)
         string = "";