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R. Silva" , linux-hardening@vger.kernel.org (open list:KERNEL HARDENING (not covered by other areas):Keyword:\b__counted_by(_le|_be)?\b) Subject: [PATCH] siox: use kzalloc_flex Date: Wed, 25 Mar 2026 21:47:25 -0700 Message-ID: <20260326044725.234216-1-rosenp@gmail.com> X-Mailer: git-send-email 2.53.0 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" Use the proper function to allocate a struct with a flexible array member. Add __counted_by for extra runtime analysis. Add counting variable assignment as required by __counted_by. Signed-off-by: Rosen Penev --- drivers/siox/siox-core.c | 5 +++-- drivers/siox/siox.h | 3 ++- 2 files changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/siox/siox-core.c b/drivers/siox/siox-core.c index 3e8f3b6a4555..b87e2a12d640 100644 --- a/drivers/siox/siox-core.c +++ b/drivers/siox/siox-core.c @@ -689,10 +689,11 @@ struct siox_master *siox_master_alloc(struct device *= dev, if (!dev) return NULL; =20 - smaster =3D kzalloc(sizeof(*smaster) + size, GFP_KERNEL); + smaster =3D kzalloc_flex(*smaster, buf, size); if (!smaster) return NULL; =20 + smaster->buf_len =3D size; device_initialize(&smaster->dev); =20 smaster->busno =3D -1; @@ -854,7 +855,7 @@ static struct siox_device *siox_device_add(struct siox_= master *smaster, } =20 smaster->buf_len =3D buf_len; - smaster->buf =3D buf; + memcpy(smaster->buf, buf, buf_len); } =20 ret =3D device_register(&sdevice->dev); diff --git a/drivers/siox/siox.h b/drivers/siox/siox.h index 513f2c8312f7..e6809fcafa0f 100644 --- a/drivers/siox/siox.h +++ b/drivers/siox/siox.h @@ -27,11 +27,12 @@ struct siox_master { =20 size_t setbuf_len, getbuf_len; size_t buf_len; - u8 *buf; u8 status; =20 unsigned long last_poll; struct task_struct *poll_thread; + + u8 buf[] __counted_by(buf_len); }; =20 static inline void *siox_master_get_devdata(struct siox_master *smaster) --=20 2.53.0