Commit 66b2477ab6

@@ -21149,7 +21149,11 @@ static IrInstGen *ir_analyze_instruction_elem_ptr(IrAnalyze *ira, IrInstSrcElemP
 
     bool safety_check_on = elem_ptr_instruction->safety_check_on;
     if (instr_is_comptime(casted_elem_index)) {
-        uint64_t index = bigint_as_u64(&casted_elem_index->value->data.x_bigint);
+        ZigValue *index_val = ir_resolve_const(ira, casted_elem_index, UndefBad);
+        if (index_val == nullptr)
+            return ira->codegen->invalid_inst_gen;
+        uint64_t index = bigint_as_u64(&index_val->data.x_bigint);
+
         if (array_type->id == ZigTypeIdArray) {
             uint64_t array_len = array_type->data.array.len +
                 (array_type->data.array.sentinel != nullptr);

@@ -0,0 +1,8 @@
+fn f(buf: []u8) void {
+    var ptr = &buf[@sizeOf(u32)];
+}
+
+test "crash" {
+    var buf: [4096]u8 = undefined;
+    f(&buf);
+}

@@ -44,6 +44,7 @@ comptime {
     _ = @import("behavior/bugs/4769_a.zig");
     _ = @import("behavior/bugs/4769_b.zig");
     _ = @import("behavior/bugs/4769_c.zig");
+    _ = @import("behavior/bugs/4954.zig");
     _ = @import("behavior/bugs/394.zig");
     _ = @import("behavior/bugs/421.zig");
     _ = @import("behavior/bugs/529.zig");