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Mon, 06 Jul 2026 19:56:23 -0700 (PDT) Date: Mon, 6 Jul 2026 19:56:20 -0700 From: Dmitry Torokhov To: Pengpeng Hou Cc: Bryam Vargas , linux-input@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] Input: iforce - validate packet lengths Message-ID: References: <20260706092016.78176-1-pengpeng@iscas.ac.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260706092016.78176-1-pengpeng@iscas.ac.cn> Hi Pengpeng, On Mon, Jul 06, 2026 at 05:20:16PM +0800, Pengpeng Hou wrote: > iforce_process_packet() decodes several packet formats from a > variable-length input buffer. > > Add minimum length checks for joystick, wheel and status packets before > reading their fixed fields. > > Signed-off-by: Pengpeng Hou > --- > drivers/input/joystick/iforce/iforce-packets.c | 9 +++++++++ > 1 file changed, 9 insertions(+) > > diff --git a/drivers/input/joystick/iforce/iforce-packets.c b/drivers/input/joystick/iforce/iforce-packets.c > index effa76bfd8f9..54697b252b84 100644 > --- a/drivers/input/joystick/iforce/iforce-packets.c > +++ b/drivers/input/joystick/iforce/iforce-packets.c > @@ -155,6 +155,9 @@ void iforce_process_packet(struct iforce *iforce, > switch (packet_id) { > > case 0x01: /* joystick position data */ > + if (len < 5) > + break; This is not enough. iforce_report_hats_buttons() is called unconditionally and is referencing data[6]. If we add checks we need to cover all cases. Thanks. -- Dmitry