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| author | Asahi Lina <lina@asahilina.net> | 2024-11-23 11:29:38 +0100 |
|---|---|---|
| committer | Miguel Ojeda <ojeda@kernel.org> | 2024-11-25 00:11:07 +0100 |
| commit | b7ed2b6f4e8d7f64649795e76ee9db67300de8eb (patch) | |
| tree | 6c52dd614e82d4577d777576a18f87d8d2751196 /rust/kernel/alloc/layout.rs | |
| parent | docs: rust: remove spurious item in `expect` list (diff) | |
| download | linux-b7ed2b6f4e8d7f64649795e76ee9db67300de8eb.tar.xz linux-b7ed2b6f4e8d7f64649795e76ee9db67300de8eb.zip | |
rust: alloc: Fix `ArrayLayout` allocations
We were accidentally allocating a layout for the *square* of the object
size due to a variable shadowing mishap.
Fixes memory bloat and page allocation failures in drm/asahi.
Reported-by: Janne Grunau <j@jannau.net>
Fixes: 9e7bbfa18276 ("rust: alloc: introduce `ArrayLayout`")
Signed-off-by: Asahi Lina <lina@asahilina.net>
Acked-by: Danilo Krummrich <dakr@kernel.org>
Reviewed-by: Neal Gompa <neal@gompa.dev>
Link: https://lore.kernel.org/r/20241123-rust-fix-arraylayout-v1-1-197e64c95bd4@asahilina.net
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Diffstat (limited to '')
| -rw-r--r-- | rust/kernel/alloc/layout.rs | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/rust/kernel/alloc/layout.rs b/rust/kernel/alloc/layout.rs index 7e0c2f46157b..4b3cd7fdc816 100644 --- a/rust/kernel/alloc/layout.rs +++ b/rust/kernel/alloc/layout.rs @@ -45,7 +45,7 @@ impl<T> ArrayLayout<T> { /// When `len * size_of::<T>()` overflows or when `len * size_of::<T>() > isize::MAX`. pub const fn new(len: usize) -> Result<Self, LayoutError> { match len.checked_mul(core::mem::size_of::<T>()) { - Some(len) if len <= ISIZE_MAX => { + Some(size) if size <= ISIZE_MAX => { // INVARIANT: We checked above that `len * size_of::<T>() <= isize::MAX`. Ok(Self { len, |