File U_glx_Fix_mask_truncation_in___glXGetAnswerBuffer.patch of Package tigervnc.407

Subject: glx: Fix mask truncation in __glXGetAnswerBuffer
References: bnc#907268, CVE-2014-8093
Patch-Mainline: Upstream
Signed-off-by: Michal Srb <msrb@suse.com>

On a system where sizeof(unsigned) != sizeof(intptr_t), the unary
bitwise not operation will result in a mask that clears all high bits
from temp_buf in the expression:
        temp_buf = (temp_buf + mask) & ~mask;

Signed-off-by: Robert Morell <rmorell@nvidia.com>
Reviewed-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
---
 glx/indirect_util.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/glx/indirect_util.c b/glx/indirect_util.c
index de81491..9ba2815 100644
--- a/glx/indirect_util.c
+++ b/glx/indirect_util.c
@@ -73,7 +73,7 @@ __glXGetAnswerBuffer(__GLXclientState * cl, size_t required_size,
                      void *local_buffer, size_t local_size, unsigned alignment)
 {
     void *buffer = local_buffer;
-    const unsigned mask = alignment - 1;
+    const intptr_t mask = alignment - 1;
 
     if (local_size < required_size) {
         size_t worst_case_size;
-- 
1.7.9.2