[igt-dev] [PATCH i-g-t] lib/intel_blt.c: ensure uint64_t result of multiplication

[Marcin Bernatowicz <marcin.bernatowicz@linux.intel.com>]

Additionally check for overflow.

This should allow to exercise large buffers
ex. xe_exercise_blt -W 16384 -H 16384

Signed-off-by: Marcin Bernatowicz <marcin.bernatowicz@linux.intel.com>
---
 lib/intel_blt.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/lib/intel_blt.c b/lib/intel_blt.c
index a76c7a404..f46c85e91 100644
--- a/lib/intel_blt.c
+++ b/lib/intel_blt.c
@@ -1607,12 +1607,18 @@ blt_create_object(const struct blt_copy_data *blt, uint32_t region,
 		  bool create_mapping)
 {
 	struct blt_copy_object *obj;
-	uint64_t size = width * height * bpp / 8;
 	uint32_t stride = tiling == T_LINEAR ? width * 4 : width;
 	uint32_t handle;
+	uint64_t size;
 
 	igt_assert_f(blt->driver, "Driver isn't set, have you called blt_copy_init()?\n");
 
+	igt_assert_f((UINT64_MAX / 8) >= width &&
+		     (UINT64_MAX / width) >= height &&
+		     (UINT64_MAX / (width * height)) >= bpp, "Overflow detected!\n");
+
+	size = (uint64_t)width * height * bpp / 8;
+
 	obj = calloc(1, sizeof(*obj));
 
 	obj->size = size;
-- 
2.42.0