linux-kernel - [PATCH v2 3/5] gpu: nova-core: use checked arithmetic in frombytes

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Message-Id: <20260126202305.2526618-4-joelagnelf@nvidia.com>
Date: Mon, 26 Jan 2026 15:23:03 -0500
From: Joel Fernandes <joelagnelf@...dia.com>
To: linux-kernel@...r.kernel.org
Cc: Paul Walmsley <pjw@...nel.org>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Alexandre Ghiti <alex@...ti.fr>,
	Miguel Ojeda <ojeda@...nel.org>,
	Boqun Feng <boqun.feng@...il.com>,
	Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <lossin@...nel.org>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Trevor Gross <tmgross@...ch.edu>,
	Danilo Krummrich <dakr@...nel.org>,
	Alexandre Courbot <acourbot@...dia.com>,
	John Hubbard <jhubbard@...dia.com>,
	Alistair Popple <apopple@...dia.com>,
	Timur Tabi <ttabi@...dia.com>,
	Edwin Peer <epeer@...dia.com>,
	Zhi Wang <zhiw@...dia.com>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Dirk Behme <dirk.behme@...il.com>,
	nouveau@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	rust-for-linux@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	Joel Fernandes <joelagnelf@...dia.com>
Subject: [PATCH v2 3/5] gpu: nova-core: use checked arithmetic in frombytes_at helper

Use checked_add() when computing the end offset in the frombytes_at()
helper function. This function is called with firmware-provided offsets.

Reviewed-by: Zhi Wang <zhiw@...dia.com>
Signed-off-by: Joel Fernandes <joelagnelf@...dia.com>
---
 drivers/gpu/nova-core/firmware/booter.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/nova-core/firmware/booter.rs b/drivers/gpu/nova-core/firmware/booter.rs
index 40ac7e66d228..bae24c756853 100644
--- a/drivers/gpu/nova-core/firmware/booter.rs
+++ b/drivers/gpu/nova-core/firmware/booter.rs
@@ -43,8 +43,9 @@
 /// Local convenience function to return a copy of `S` by reinterpreting the bytes starting at
 /// `offset` in `slice`.
 fn frombytes_at<S: FromBytes + Sized>(slice: &[u8], offset: usize) -> Result<S> {
+    let end = offset.checked_add(size_of::<S>()).ok_or(EINVAL)?;
     slice
-        .get(offset..offset + size_of::<S>())
+        .get(offset..end)
         .and_then(S::from_bytes_copy)
         .ok_or(EINVAL)
 }
-- 
2.34.1