From nobody Fri Jul 10 22:22:59 2026 Received: from metis.whiteo.stw.pengutronix.de (metis.whiteo.stw.pengutronix.de [185.203.201.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 14F9C134CFE for ; Tue, 14 May 2024 10:34:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.203.201.7 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715682852; cv=none; b=jBa389sZLpMWa2JmwepQ4DrGrUkG6EecIf0igljWLQCzAQmRHj+zqCmJJ/diFJp92T6q7YrnMW5AQ9/bD/HSJwx3vbDM35/Oty+6f5iM/oHZjI6OXOhnrRlBv628p2zIhpgXJ9HgEDdKBQvOksbBh9KbbC81cIqymzZ4yqZuvcQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715682852; c=relaxed/simple; bh=aRk6NvPZjBiEJiRpLJXdgQJsFiOoBHTdq0kSIFpu1og=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=D/XwNpYqAgR0R23Gm3zQxOvJ1eZ5/r/onzUvUr4buhw3mi4B1GSM+hZwLBCj+8CiqVvFv07avAahiybqFOZXMLCynPcd/JBcaFcqJXDcrqU3AOJeBlAvbWTIsn5pe4X549oInQni6Sraq4eUR9wRbu8EGhhG0yY9jXY6r38Lys0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de; spf=pass smtp.mailfrom=pengutronix.de; arc=none smtp.client-ip=185.203.201.7 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=pengutronix.de Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1s6pTv-0006iz-Tn; Tue, 14 May 2024 12:34:03 +0200 Received: from [2a0a:edc0:0:1101:1d::28] (helo=dude02.red.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1s6pTv-001KzM-C5; Tue, 14 May 2024 12:34:03 +0200 Received: from localhost ([::1] helo=dude02.red.stw.pengutronix.de) by dude02.red.stw.pengutronix.de with esmtp (Exim 4.96) (envelope-from ) id 1s6pTv-003QYu-0p; Tue, 14 May 2024 12:34:03 +0200 From: Sascha Hauer To: linux-mtd@lists.infradead.org Cc: linux-kernel@vger.kernel.org, Miquel Raynal , Richard Weinberger , Sascha Hauer Subject: [PATCH] mtd: rawnand: make rawnand_check_data_only_read_support() work Date: Tue, 14 May 2024 12:33:55 +0200 Message-Id: <20240514103355.817056-1-s.hauer@pengutronix.de> X-Mailer: git-send-email 2.39.2 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 X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: s.hauer@pengutronix.de X-SA-Exim-Scanned: No (on metis.whiteo.stw.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" rawnand_check_data_only_read_support() calls nand_read_data_op() with a NULL pointer as buffer which will immediately return an error. Allow a NULL buffer pointer when check_only is requested. This should be safe to do as nand_read_data_op() has no business in touching the buffer in check_only mode. Fixes: 9f820fc0651c ("mtd: rawnand: Check the data only read pattern only o= nce") Signed-off-by: Sascha Hauer --- drivers/mtd/nand/raw/nand_base.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_b= ase.c index d7dbbd469b892..a5e7d8deafbbe 100644 --- a/drivers/mtd/nand/raw/nand_base.c +++ b/drivers/mtd/nand/raw/nand_base.c @@ -2173,7 +2173,7 @@ EXPORT_SYMBOL_GPL(nand_reset_op); int nand_read_data_op(struct nand_chip *chip, void *buf, unsigned int len, bool force_8bit, bool check_only) { - if (!len || !buf) + if (!len || (!buf && !check_only)) return -EINVAL; =20 if (nand_has_exec_op(chip)) { --=20 2.39.2