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([41.238.114.180]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-439fe20c0b4sm31185193f8f.25.2026.03.14.15.29.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 14 Mar 2026 15:29:38 -0700 (PDT) From: Osama Abdelkader To: Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Suren Baghdasaryan , Lorenzo Stoakes , Oscar Salvador , Andrew Morton , Qi Zheng , Osama Abdelkader , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH] riscv: mm: add null check for find_vm_area in set_memory Date: Sat, 14 Mar 2026 23:28:14 +0100 Message-ID: <20260314222815.153203-1-osama.abdelkader@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" find_vm_area() can return NULL. Add a null check to avoid potential null pointer dereference, matching the pattern used by other arches. Signed-off-by: Osama Abdelkader --- arch/riscv/mm/pageattr.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/riscv/mm/pageattr.c b/arch/riscv/mm/pageattr.c index 3f76db3d2769..46a999c86b26 100644 --- a/arch/riscv/mm/pageattr.c +++ b/arch/riscv/mm/pageattr.c @@ -289,6 +289,10 @@ static int __set_memory(unsigned long addr, int numpag= es, pgprot_t set_mask, int i, page_start; =20 area =3D find_vm_area((void *)start); + if (!area) { + ret =3D -EINVAL; + goto unlock; + } page_start =3D (start - (unsigned long)area->addr) >> PAGE_SHIFT; =20 for (i =3D page_start; i < page_start + numpages; ++i) { --=20 2.43.0