On Thu, 2010-03-04 at 02:00 -0800, Vinson Lee wrote:
> Michel, thanks for spotting this.
>
> I've reverted the bad commit. Please go ahead and submit your correct fix.
Actually, I wonder if something like the below isn't needed to avoid any
undesired effects from integer overflows.
diff --git a/src/mesa/main/api_validate.c b/src/mesa/main/api_validate.c
index 326ad6f..8460265 100644
--- a/src/mesa/main/api_validate.c
+++ b/src/mesa/main/api_validate.c
@@ -130,6 +130,7 @@ check_index_bounds(GLcontext *ctx, GLsizei count, GLenum
type,
struct _mesa_prim prim;
struct _mesa_index_buffer ib;
GLuint min, max;
+ GLint64 min64, max64;
/* Only the X Server needs to do this -- otherwise, accessing outside
* array/BO bounds allows application termination.
@@ -146,9 +147,12 @@ check_index_bounds(GLcontext *ctx, GLsizei count, GLenum
type,
ib.obj = ctx->Array.ElementArrayBufferObj;
vbo_get_minmax_index(ctx, &prim, &ib, &min, &max);
+ min64 = min;
+ min64 += basevertex;
+ max64 = max;
+ max64 += basevertex;
- if (min + basevertex < 0 ||
- max + basevertex > ctx->Array.ArrayObj->_MaxElement) {
+ if (min64 < 0 || max64 > ctx->Array.ArrayObj->_MaxElement) {
/* the max element is out of bounds of one or more enabled arrays */
_mesa_warning(ctx, "glDrawElements() index=%u is "
"out of bounds (max=%u)", max,
ctx->Array.ArrayObj->_MaxElement);
--
Earthling Michel Dänzer | http://www.vmware.com
Libre software enthusiast | Debian, X and DRI developer
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