From: Ilia Mirkin <imirkin@alum.mit.edu>
Date: Wed, 22 Jan 2014 00:45:18 +0000 (-0500)
Subject: translate: deal with size overflows by casting to ptrdiff_t
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=3de97ce9200e9fe96891e7e92ec83f0fc38d8693;p=mesa.git

translate: deal with size overflows by casting to ptrdiff_t

This was discovered as a result of the draw-elements-base-vertex-neg
piglit test, which passes very negative offsets in, followed up by large
indices. The nouveau code correctly adjusts the pointer, but the
translate code needs to do the proper inverse correction. Similarly fix
up the SSE code to do a 64-bit multiply to compute the proper offset.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Brian Paul <brianp@vmware.com>
---

diff --git a/src/gallium/auxiliary/translate/translate_generic.c b/src/gallium/auxiliary/translate/translate_generic.c
index 5bf97db35d1..5ffce32ba70 100644
--- a/src/gallium/auxiliary/translate/translate_generic.c
+++ b/src/gallium/auxiliary/translate/translate_generic.c
@@ -638,7 +638,7 @@ static ALWAYS_INLINE void PIPE_CDECL generic_run_one( struct translate_generic *
          }
 
          src = tg->attrib[attr].input_ptr +
-               tg->attrib[attr].input_stride * index;
+               (ptrdiff_t)tg->attrib[attr].input_stride * index;
 
          copy_size = tg->attrib[attr].copy_size;
          if(likely(copy_size >= 0))
diff --git a/src/gallium/auxiliary/translate/translate_sse.c b/src/gallium/auxiliary/translate/translate_sse.c
index a78ea916a8e..a72454a808a 100644
--- a/src/gallium/auxiliary/translate/translate_sse.c
+++ b/src/gallium/auxiliary/translate/translate_sse.c
@@ -1121,7 +1121,9 @@ static boolean init_inputs( struct translate_sse *p,
             x86_cmovcc(p->func, tmp_EAX, buf_max_index, cc_AE);
          }
 
-         x86_imul(p->func, tmp_EAX, buf_stride);
+         x86_mov(p->func, p->tmp2_EDX, buf_stride);
+         x64_rexw(p->func);
+         x86_imul(p->func, tmp_EAX, p->tmp2_EDX);
          x64_rexw(p->func);
          x86_add(p->func, tmp_EAX, buf_base_ptr);
 
@@ -1207,7 +1209,9 @@ static struct x86_reg get_buffer_ptr( struct translate_sse *p,
       x86_cmp(p->func, ptr, buf_max_index);
       x86_cmovcc(p->func, ptr, buf_max_index, cc_AE);
 
-      x86_imul(p->func, ptr, buf_stride);
+      x86_mov(p->func, p->tmp2_EDX, buf_stride);
+      x64_rexw(p->func);
+      x86_imul(p->func, ptr, p->tmp2_EDX);
       x64_rexw(p->func);
       x86_add(p->func, ptr, buf_base_ptr);
       return ptr;