From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx01.bremer-it.com (mx01.bremer-it.com [85.215.132.167]) (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 AFE563E168A for ; Mon, 10 Aug 2026 16:27:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=85.215.132.167 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786379240; cv=none; b=RqspSPh1RYCRWAzQEPD2ieKriwuEW0cqDSuE9d8fRlfG6YBxWF1LPVH/kIaTDaxMFt+fIQ8kc8CoruRRqhD17aLs/YcE5ZpfPOcgdtXHNVdFjpKGt5OVshonYboD0RmiB8ufYy15vqIcpC1gK6dwU6ooe/hct6GKO3ZgZm6AjIY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786379240; c=relaxed/simple; bh=jsUiXvYLhDDymzcI4PGC1T2ERRBgyk8sFjAfR/MMzIs=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=aQ+pXKzTvB6/0DENi2oYwKDFubr+Mw4/HQlXTv0zeaUXWFbaC3al1C0kiyVVKen0VbNz10pcR1PAr4/k9CX14jzhXgsv2IALcbYUeyfJGO1ggyyFmAP/wWpyZ/oTLoy7/jxp8WCxVgF+TlnerLrJPIFkZzA+ia4+EBGN9I0J4Cs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=barelysecure.org; spf=pass smtp.mailfrom=barelysecure.org; dkim=pass (2048-bit key) header.d=barelysecure.org header.i=@barelysecure.org header.b=ij4wMgzB; arc=none smtp.client-ip=85.215.132.167 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=barelysecure.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=barelysecure.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=barelysecure.org header.i=@barelysecure.org header.b="ij4wMgzB" Received: from cashel.logfs.org (c-98-33-96-243.hsd1.ca.comcast.net [98.33.96.243]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (prime256v1) server-signature ECDSA (secp384r1) server-digest SHA384) (No client certificate requested) by mx01.bremer-it.com (Postfix) with ESMTPSA id 36C262CEED; Mon, 10 Aug 2026 18:27:08 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=barelysecure.org; s=dkim68; t=1786379230; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=LO13ef2TxdO/styNqou6d7A1gNqNOKIeD9RlfWxP/ic=; b=ij4wMgzBD8dgGbE7KRAuQge0Q64I8oSLDT/+ZNmU3Hk4e6RKEZ3FePoPdqLLHWxMHcP+QH juBF/MlYTPVzh4r+vg2dxcg3m+r6wTKI0yRi88aMwgoQmJlQ4IG8MArwmaJ4jC7Q6Z8Ltq A8HxUpaBO8lSsHkH3JS3AfP3uYZAEEpGePnzJ6peyDonRQFFyXVAIphwJVKxdRPpHr5geX DXzZLAsPE7ALDJVTId0M17ryNfBDS4MtzREP9n9yOfkpBP1m1gJK1r24+z3aKWTJIHMwA7 fiNbg0kzQRFJqtwGkYpsvQMNy2CtP/sKB2oEGslf4gnFiXZGfYGbrAyr4ZfPQg== Authentication-Results: ORIGINATING; auth=pass smtp.auth=joern@lazybastard.org smtp.mailfrom=joern@barelysecure.org Date: Mon, 10 Aug 2026 09:27:03 -0700 From: =?iso-8859-1?Q?J=F6rn?= Engel To: syzbot Cc: linux-kernel@vger.kernel.org, linux-mtd@lists.infradead.org, miquel.raynal@bootlin.com, richard@nod.at, syzkaller-bugs@googlegroups.com, vigneshr@ti.com, Fabian Frederick Subject: Re: [syzbot] [mtd?] divide error in block2mtd_setup2 Message-ID: References: <6a791c94.01d0871a.3a0d52.009b.GAE@google.com> 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=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Spam-Level: * X-Rspamd-Action: no action X-Spamd-Result: default: False [1.40 / 14.00]; SUSPICIOUS_RECIPS(1.50)[]; MIME_GOOD(-0.10)[text/plain]; ARC_NA(0.00)[]; TAGGED_RCPT(0.00)[b320a4d5f65a61dbbf89]; FROM_HAS_DN(0.00)[]; ASN(0.00)[asn:7922, ipnet:98.32.0.0/11, country:US]; MIME_TRACE(0.00)[0:+]; MISSING_XM_UA(0.00)[]; RCVD_COUNT_ZERO(0.00)[0]; RCPT_COUNT_SEVEN(0.00)[8]; ALIAS_RESOLVED(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; TO_DN_SOME(0.00)[]; LOCAL_OUTBOUND(0.00)[]; DKIM_SIGNED(0.00)[barelysecure.org:s=dkim68]; TO_MATCH_ENVRCPT_ALL(0.00)[]; SUBJECT_HAS_QUESTION(0.00)[] X-Rspamd-Server: server01 X-Rspamd-Queue-Id: 36C262CEED X-Spamd-Bar: + On Sun, Aug 09, 2026 at 07:03:22PM -0700, Jörn Engel wrote: > > Best guess would be this: > > if ((long)size % erase_size) { While at it, what purpose does the cast to (long) serve? As far as I can see, it is useless and should be removed. Fabian, do you remember why it was necessary? Jörn -- The real voyage of discovery consists not in seeking new landscapes, but in having new eyes. -- Marcel Proust