Mesa (master): meta: Add assertion check for ctx->Meta->SaveStackDepth

[Anuj Phogat]

Module: Mesa
Branch: master
Commit: 8d6ae49a8b18ad8006ff8f22caf06bad83b96e6b
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=8d6ae49a8b18ad8006ff8f22caf06bad83b96e6b

Author: Anuj Phogat <anuj.phogat at gmail.com>
Date:   Tue Feb  3 17:04:45 2015 -0800

meta: Add assertion check for ctx->Meta->SaveStackDepth

before using it for derefrencing.

Signed-off-by: Anuj Phogat <anuj.phogat at gmail.com>
Reviewed-by: Neil Roberts <neil at linux.intel.com>

---

 src/mesa/drivers/common/meta.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/mesa/drivers/common/meta.c b/src/mesa/drivers/common/meta.c
index dabf934..fdc4cf1 100644
--- a/src/mesa/drivers/common/meta.c
+++ b/src/mesa/drivers/common/meta.c
@@ -823,6 +823,8 @@ _mesa_meta_begin(struct gl_context *ctx, GLbitfield state)
 void
 _mesa_meta_end(struct gl_context *ctx)
 {
+   assert(ctx->Meta->SaveStackDepth > 0);
+
    struct save_state *save = &ctx->Meta->Save[ctx->Meta->SaveStackDepth - 1];
    const GLbitfield state = save->SavedState;
    int i;