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Wed, 22 Apr 2026 18:36:27 -0700 (PDT) Date: Wed, 22 Apr 2026 18:36:24 -0700 From: Dmitry Torokhov To: Greg Kroah-Hartman Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, stable Subject: Re: [PATCH] Input: ims-pcu - bound frame parser write index against read_buf size Message-ID: References: <2026042030-mobilize-suspense-88f9@gregkh> 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: <2026042030-mobilize-suspense-88f9@gregkh> Hi Greg, On Mon, Apr 20, 2026 at 09:05:31PM +0200, Greg Kroah-Hartman wrote: > ims_pcu_process_data() implements a STX/DLE/ETX byte-stuffing parser > that accumulates frame payload into pcu->read_buf[] using the running > index pcu->read_pos. read_buf is IMS_PCU_BUF_SIZE (128) bytes and > read_pos is u8 but of course, we don't check the index before actually > writing the data :( > > Fix this up by properly rejecting the frame at the first attempt to > write past read_buf and resync on the next STX, mirroring how the parser > handles short and bad-checksum frames on ETX. > > Cc: Dmitry Torokhov > Fixes: 628329d52474 ("Input: add IMS Passenger Control Unit driver") > Cc: stable > Assisted-by: gkh_clanker_t1000 > Signed-off-by: Greg Kroah-Hartman I already have a patch for this, thanks. -- Dmitry