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Tue, 03 Nov 2026 05:36:43 -0800 (PST) Received: from arpith-debian ([2402:3a80:40d:48cf:34b0:c816:2853:c60c]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-1ac192c27cdsm73904112c88.10.2026.11.03.05.36.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 Nov 2026 05:36:42 -0800 (PST) From: Arpith Alexander To: liuwb@xiaopeng.com Cc: broonie@kernel.org, linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org, lixu.zhang@intel.com, sakari.ailus@linux.intel.com, stable@vger.kernel.org, wentong.wu@intel.com Subject: Re: [PATCH v2] spi: ljca: validate the response length before copying the data Date: Tue, 3 Nov 2026 19:06:08 +0530 Message-ID: <20261103133608.29246-1-arpith99@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20261013031717.3933277-1-liuwb@xiaopeng.com> References: <20261013031717.3933277-1-liuwb@xiaopeng.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On Tue, 13 Oct 2026 11:17:17 +0800, Weibin Liu wrote: > Check that the response carries the full header before reading > r_packet->len, then reject responses whose payload is not contained in > the data received or is longer than the requested transfer. This breaks SPI writes on a Dell XPS 13 9340: the LJCA acks a write with only the packet header (len = bytes written, no payload), so every write now fails with -EIO and the IVSC behind it no longer initialises. Fix posted here: https://lore.kernel.org/linux-spi/20261103131435.21838-1-arpith99@gmail.com/