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fix: alloc(0) call is UB #442

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fix: alloc(0) call is UB #442

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15 changes: 13 additions & 2 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1051,6 +1051,15 @@ impl AlignedBuf {
/// Creates a new buffer that is aligned with the simd register size
#[must_use]
pub fn with_capacity(capacity: usize) -> Self {
if capacity == 0 {
let layout = Layout::from_size_align(0, SIMDJSON_PADDING).unwrap();
return Self {
layout,
capacity: 0,
len: 0,
inner: NonNull::dangling(),
};
}
let Ok(layout) = Layout::from_size_align(capacity, SIMDJSON_PADDING) else {
Self::capacity_overflow()
};
Expand Down Expand Up @@ -1092,8 +1101,10 @@ impl AlignedBuf {
}
impl Drop for AlignedBuf {
fn drop(&mut self) {
unsafe {
dealloc(self.inner.as_ptr(), self.layout);
if self.capacity > 0 {
unsafe {
dealloc(self.inner.as_ptr(), self.layout);
}
}
}
}
Expand Down