Fix uint32 overflow in fill_empty_gamma_table on Icelake platform

Closes: swaywm/sway#4826
swaywm · Mar 15, 2020 · 5ee52a3 · 5ee52a3
1 parent 1282c3b
commit 5ee52a3
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/backend/drm/drm.c b/backend/drm/drm.c
@@ -501,8 +501,9 @@ static bool drm_connector_commit(struct wlr_output *output) {
 
 static void fill_empty_gamma_table(size_t size,
 		uint16_t *r, uint16_t *g, uint16_t *b) {
+	assert(0xFFFF < UINT64_MAX / (size - 1));	
 	for (uint32_t i = 0; i < size; ++i) {
-		uint16_t val = (uint32_t)0xffff * i / (size - 1);
+		uint16_t val = (uint64_t)0xffff * i / (size - 1);
 		r[i] = g[i] = b[i] = val;
 	}
 }