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rusticl/mem: use cl_slice::from_raw_parts in place of std::slice

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The cl_slice version of this function checks several invariants for us,
providing a slight safety net.

v2: reordered commits to allow cherry-picking bugfixes

Reviewed-by: Karol Herbst <kherbst@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33989>
This commit is contained in:
Seán de Búrca 2025-03-12 09:59:46 -07:00 • committed by Marge Bot
parent 5e365f1674
commit aa9109f0b5
1 changed files with 12 additions and 5 deletions
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17
src/gallium/frontends/rusticl/api/memory.rs
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@ -26,7 +26,6 @@ use std::cmp::Ordering;
use std::mem::{self, MaybeUninit};
use std::os::raw::c_void;
use std::ptr;
use std::slice;
use std::sync::Arc;
fn validate_mem_flags(flags: cl_mem_flags, images: bool) -> CLResult<()> {
@ -1612,8 +1611,12 @@ fn enqueue_fill_buffer(
return Err(CL_INVALID_CONTEXT);
}
// we have to copy memory
let pattern = unsafe { slice::from_raw_parts(pattern.cast(), pattern_size).to_vec() };
// The caller may free `pattern` once the `clEnqueueFillBuffer()` call
// returns, so we need to duplicate its contents to hold onto.
// SAFETY: `cl_slice::from_raw_parts()` verifies the testable invariants of
// `slice::from_raw_parts()`. The caller is responsible for providing a
// pointer to appropriately-sized, initialized memory.
let pattern = unsafe { cl_slice::from_raw_parts(pattern.cast(), pattern_size)? }.to_vec();
create_and_queue(
q,
CL_COMMAND_FILL_BUFFER,
@ -2421,8 +2424,12 @@ fn enqueue_svm_free_impl(
// The application is allowed to reuse or free the memory referenced by `svm_pointers` after this
// function returns, so we have to make a copy.
let mut svm_pointers = if !svm_pointers.is_null() {
// SAFETY: num_svm_pointers specifies the amount of elements in svm_pointers
unsafe { slice::from_raw_parts(svm_pointers.cast(), num_svm_pointers as usize) }.to_vec()
// SAFETY: `cl_slice::from_raw_parts()` verifies that testable
// invariants of `slice::from_raw_parts()` are satisfied. Callers are
// responsible for providing pointers to appropriately-sized,
// initialized memory.
unsafe { cl_slice::from_raw_parts(svm_pointers.cast(), num_svm_pointers as usize)? }
.to_vec()
} else {
// A slice must not be created from a raw null pointer, so simply create
// an empty vec instead.