codegen: fix accidental stack UAF

mlugg · jacobly0 · commit b4a0a082dca2 · 2025-05-31T18:54:28.000-04:00
diff --git a/src/codegen.zig b/src/codegen.zig
@@ -67,7 +67,7 @@ pub fn legalizeFeatures(pt: Zcu.PerThread, nav_index: InternPool.Nav.Index) *con
         .stage2_powerpc,
         => |backend| {
             const Backend = importBackend(backend);
-            return if (@hasDecl(Backend, "legalizeFeatures")) Backend.legalizeFeatures(target) else &.initEmpty();
+            return if (@hasDecl(Backend, "legalizeFeatures")) Backend.legalizeFeatures(target) else comptime &.initEmpty();
         },
     }
 }

Original file line number	Diff line number	Diff line change
`@@ -67,7 +67,7 @@ pub fn legalizeFeatures(pt: Zcu.PerThread, nav_index: InternPool.Nav.Index) *con`
`67`	`67`	`.stage2_powerpc,`
`68`	`68`	`=> \|backend\| {`
`69`	`69`	`const Backend = importBackend(backend);`
`70`		`- return if (@hasDecl(Backend, "legalizeFeatures")) Backend.legalizeFeatures(target) else &.initEmpty();`
	`70`	`+ return if (@hasDecl(Backend, "legalizeFeatures")) Backend.legalizeFeatures(target) else comptime &.initEmpty();`
`71`	`71`	`},`
`72`	`72`	`}`
`73`	`73`	`}`