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 <[email protected]>
Reviewed-by: Brian Paul <[email protected]>

1 files changed, 6 insertions, 2 deletions

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;