linux-kernel - [PATCH 5.15 008/917] scsi: scsi

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Date:   Mon, 15 Nov 2021 17:51:43 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Bart Van Assche <bvanassche@....org>,
        Christoph Hellwig <hch@....de>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org,
        Tadeusz Struk <tadeusz.struk@...aro.org>
Subject: [PATCH 5.15 008/917] scsi: scsi_ioctl: Validate command size

From: Tadeusz Struk <tadeusz.struk@...aro.org>

commit 20aaef52eb08f1d987d46ad26edb8f142f74d83a upstream.

Need to make sure the command size is valid before copying the command from
user space.

Link: https://lore.kernel.org/r/20211103170659.22151-1-tadeusz.struk@linaro.org
Cc: Bart Van Assche <bvanassche@....org>
Cc: Christoph Hellwig <hch@....de>
Cc: James E.J. Bottomley <jejb@...ux.ibm.com>
Cc: Martin K. Petersen <martin.petersen@...cle.com>
Cc: <linux-scsi@...r.kernel.org>
Cc: <linux-kernel@...r.kernel.org>
Cc: <stable@...r.kernel.org> # 5.15, 5.14, 5.10
Signed-off-by: Tadeusz Struk <tadeusz.struk@...aro.org>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/scsi/scsi_ioctl.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/scsi/scsi_ioctl.c
+++ b/drivers/scsi/scsi_ioctl.c
@@ -347,6 +347,8 @@ static int scsi_fill_sghdr_rq(struct scs
 {
 	struct scsi_request *req = scsi_req(rq);
 
+	if (hdr->cmd_len < 6)
+		return -EMSGSIZE;
 	if (copy_from_user(req->cmd, hdr->cmdp, hdr->cmd_len))
 		return -EFAULT;
 	if (!scsi_cmd_allowed(req->cmd, mode))