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Handle field projections like slice indexing in invalid_reference_casting #124908

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merged 1 commit into from
May 9, 2024
Merged

Handle field projections like slice indexing in invalid_reference_casting #124908

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3 changes: 2 additions & 1 deletion compiler/rustc_lint/src/reference_casting.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -202,7 +202,8 @@ fn is_cast_to_bigger_memory_layout<'tcx>(

// if the current expr looks like this `&mut expr[index]` then just looking
// at `expr[index]` won't give us the underlying allocation, so we just skip it
if let ExprKind::Index(..) = e_alloc.kind {
// the same logic applies field access like `&mut expr.field`
if let ExprKind::Index(..) | ExprKind::Field(..) = e_alloc.kind {
return None;
}

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6 changes: 6 additions & 0 deletions tests/ui/lint/reference_casting.rs
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Expand Up @@ -255,6 +255,12 @@ unsafe fn bigger_layout() {
let a3 = a2 as *mut u64;
unsafe { *a3 = 3 };
}

unsafe fn field_access(v: &mut Vec3<i32>) {
let r = &mut v.0;
let ptr = r as *mut i32 as *mut Vec3<i32>;
unsafe { *ptr = Vec3(0, 0, 0) }
}
}

const RAW_PTR: *mut u8 = 1 as *mut u8;
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