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Ensure we never consider the null pointer dereferencable #97216

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Jun 1, 2022
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Ensure we never consider the null pointer dereferencable #97216

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4 changes: 4 additions & 0 deletions compiler/rustc_const_eval/src/interpret/memory.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -441,6 +441,10 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
msg,
})
}
// Ensure we never consider the null pointer dereferencable.
if M::PointerTag::OFFSET_IS_ADDR {
assert_ne!(ptr.addr(), Size::ZERO);
}
// Test align. Check this last; if both bounds and alignment are violated
// we want the error to be about the bounds.
if let Some(align) = align {
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