build_runner: fix oob access

PauloCampana · andrewrk · commit 854e86c5676d · 2024-07-08T16:59:38.000-04:00
diff --git a/lib/compiler/build_runner.zig b/lib/compiler/build_runner.zig
@@ -1208,7 +1208,7 @@ fn nextArg(args: [][:0]const u8, idx: *usize) ?[:0]const u8 {
 
 fn nextArgOrFatal(args: [][:0]const u8, idx: *usize) [:0]const u8 {
     return nextArg(args, idx) orelse {
-        std.debug.print("expected argument after '{s}'\n  access the help menu with 'zig build -h'\n", .{args[idx.*]});
+        std.debug.print("expected argument after '{s}'\n  access the help menu with 'zig build -h'\n", .{args[idx.* - 1]});
         process.exit(1);
     };
 }

Original file line number	Diff line number	Diff line change
`@@ -1208,7 +1208,7 @@ fn nextArg(args: [][:0]const u8, idx: *usize) ?[:0]const u8 {`
`1208`	`1208`
`1209`	`1209`	`fn nextArgOrFatal(args: [][:0]const u8, idx: *usize) [:0]const u8 {`
`1210`	`1210`	`return nextArg(args, idx) orelse {`
`1211`		`- std.debug.print("expected argument after '{s}'\n access the help menu with 'zig build -h'\n", .{args[idx.*]});`
	`1211`	`+ std.debug.print("expected argument after '{s}'\n access the help menu with 'zig build -h'\n", .{args[idx.* - 1]});`
`1212`	`1212`	`process.exit(1);`
`1213`	`1213`	`};`
`1214`	`1214`	`}`