From nobody Tue Sep 29 00:33:19 2026 Received: from cstnet.cn (smtp25.cstnet.cn [159.226.251.25]) (using TLSv1.2 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2384B40B6F9; Fri, 14 Aug 2026 09:29:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=159.226.251.25 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786699797; cv=none; b=IsIa5cax0ITQfzD7yQpbJ+G/4hl+zES4Z1YcoX8McN67Juj8/5K1/YxTnKzeldx9ZBEajUgT8/PeBHf1mSSwwHEcWd+O/iev5RdmT9uh1KdZq9R1h+5FWv7kbmi+0W1QX2C9Sju7kXDPfBmXGgpPSNtqQqFnF5IHcPqTJ/EtKUU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786699797; c=relaxed/simple; bh=RjEBk/AFSe5ilhtsjLdJ72/P9G65mu5A5G4QI46ND1Y=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=CJ9BxqNbSv3K0UEfdHosuTnJPbhbCRkLhwIyQNGbWF9iOsV4ONO7MD/hBFiVqXuaPizOtjUgMhTpXJPfsX5sSfVVrmaGM5yYRBYXVUVOCky+2CkAxazot91A5A30RnrKfkk7++KCEMXYYeEVSZMWBgyp6aPMgYBN1sErNgFnKH0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn; spf=pass smtp.mailfrom=iscas.ac.cn; arc=none smtp.client-ip=159.226.251.25 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=iscas.ac.cn Received: from DESKTOP-L0HPE2S.localdomain (unknown [36.110.52.2]) by APP-05 (Coremail) with SMTP id zQCowAAXSEIE4H5qBdWvBQ--.46336S2; Fri, 14 Aug 2026 17:29:41 +0800 (CST) From: Haotian Zhang To: don.brace@microchip.com, James.Bottomley@HansenPartnership.com, martin.petersen@oracle.com Cc: storagedev@microchip.com, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, Haotian Zhang Subject: [PATCH] scsi: hpsa: fix divide-by-zero in hpsa_scsi_ioaccel_raid_map Date: Fri, 14 Aug 2026 17:00:15 +0800 Message-ID: <20260814090015.10207-1-vulab@iscas.ac.cn> X-Mailer: git-send-email 2.43.0 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-CM-TRANSID: zQCowAAXSEIE4H5qBdWvBQ--.46336S2 X-Coremail-Antispam: 1UD129KBjvJXoW7KF18ZF45Jw4DWF45Zw4Dtwb_yoW8JF4DpF Z3uay7u34rurnIga1kXw17ZF1FkanaqFyxuay8G3y5uF90q34jvF4xGF93Wr95Krs5Jrn0 vFZ8Ar1rWFyIvFUanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUkC14x267AKxVW8JVW5JwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2ocxC64kIII0Yj41l84x0c7CEw4AK67xGY2AK02 1l84ACjcxK6xIIjxv20xvE14v26F1j6w1UM28EF7xvwVC0I7IYx2IY6xkF7I0E14v26F4j 6r4UJwA2z4x0Y4vEx4A2jsIE14v26rxl6s0DM28EF7xvwVC2z280aVCY1x0267AKxVW0oV Cq3wAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0 I7IYx2IY67AKxVWUtVWrXwAv7VC2z280aVAFwI0_Gr1j6F4UJwAm72CE4IkC6x0Yz7v_Jr 0_Gr1lF7xvr2IYc2Ij64vIr41lF7I21c0EjII2zVCS5cI20VAGYxC7MxkF7I0En4kS14v2 6r126r1DMxAIw28IcxkI7VAKI48JMxC20s026xCaFVCjc4AY6r1j6r4UMI8I3I0E5I8CrV AFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_JrI_JrWlx4CE17CEb7AF67AKxVWUAVWUtwCI c40Y0x0EwIxGrwCI42IY6xIIjxv20xvE14v26r1j6r1xMIIF0xvE2Ix0cI8IcVCY1x0267 AKxVWUJVW8JwCI42IY6xAIw20EY4v20xvaj40_Jr0_JF4lIxAIcVC2z280aVAFwI0_Jr0_ Gr1lIxAIcVC2z280aVCY1x0267AKxVWUJVW8JbIYCTnIWIevJa73UjIFyTuYvjfUO2NtDU UUU X-CM-SenderInfo: pyxotu46lvutnvoduhdfq/1tbiCRQTA2p90DD94gABsk Content-Type: text/plain; charset="utf-8" hpsa_scsi_ioaccel_raid_map() divides by blocks_per_row, the product of data_disks_per_row and strip_size, two controller-supplied RAID map fields that are never validated. If either field is zero, the unguarded division raises a divide-by-zero exception on every I/O to an offload-enabled logical volume. Check blocks_per_row for zero as soon as it is computed. If it is zero, turn off ioaccel for the device and return IO_ACCEL_INELIGIBLE. Fixes: 283b4a9b98b1 ("[SCSI] hpsa: add ioaccell mode 1 RAID offload support= .") Signed-off-by: Haotian Zhang --- drivers/scsi/hpsa.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c index 3654b12c5d5a..fd1e07079a9c 100644 --- a/drivers/scsi/hpsa.c +++ b/drivers/scsi/hpsa.c @@ -5206,6 +5206,10 @@ static int hpsa_scsi_ioaccel_raid_map(struct ctlr_in= fo *h, /* calculate stripe information for the request */ blocks_per_row =3D le16_to_cpu(map->data_disks_per_row) * le16_to_cpu(map->strip_size); + if (blocks_per_row =3D=3D 0) { + hpsa_turn_off_ioaccel_for_device(dev); + return IO_ACCEL_INELIGIBLE; + } strip_size =3D le16_to_cpu(map->strip_size); #if BITS_PER_LONG =3D=3D 32 tmpdiv =3D first_block; --=20 2.43.0