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Fix UB in impl VertexBufferCollection for Vec<Subbuffer<T>> (#2577)

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marc0246 2024-10-16 19:50:54 +02:00 committed by GitHub
parent 1da590f6a1
commit d1a9314c28
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1 changed files with 7 additions and 2 deletions
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9
vulkano/src/pipeline/graphics/vertex_input/collection.rs
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@ -1,5 +1,5 @@
use crate::buffer::Subbuffer;
use std::mem;
use std::mem::{self, ManuallyDrop};
/// A collection of vertex buffers.
pub trait VertexBuffersCollection {
@ -32,8 +32,13 @@ impl<T: ?Sized> VertexBuffersCollection for Vec<Subbuffer<T>> {
mem::align_of::<Subbuffer<[u8]>>(),
);
let mut this = ManuallyDrop::new(self);
let cap = this.capacity();
let len = this.len();
let ptr = this.as_mut_ptr();
// SAFETY: All `Subbuffer`s share the same layout.
unsafe { mem::transmute::<Vec<Subbuffer<T>>, Vec<Subbuffer<[u8]>>>(self) }
unsafe { Vec::from_raw_parts(ptr.cast(), len, cap) }
}
}