linux-kernel - FAILED: patch "[PATCH] scsi: scsi_ioctl: Validate command size" failed to apply to 5.10-stable tree

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Date:   Sat, 13 Nov 2021 12:29:48 +0100
From:   <gregkh@...uxfoundation.org>
To:     tadeusz.struk@...aro.org, bvanassche@....org, hch@....de,
        jejb@...ux.ibm.com, linux-kernel@...r.kernel.org,
        linux-scsi@...r.kernel.org, martin.petersen@...cle.com,
        stable@...r.kernel.org
Cc:     <stable@...r.kernel.org>
Subject: FAILED: patch "[PATCH] scsi: scsi_ioctl: Validate command size" failed to apply to 5.10-stable tree

The patch below does not apply to the 5.10-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@...r.kernel.org>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

>From 20aaef52eb08f1d987d46ad26edb8f142f74d83a Mon Sep 17 00:00:00 2001
From: Tadeusz Struk <tadeusz.struk@...aro.org>
Date: Wed, 3 Nov 2021 10:06:58 -0700
Subject: [PATCH] scsi: scsi_ioctl: Validate command size

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>

diff --git a/drivers/scsi/scsi_ioctl.c b/drivers/scsi/scsi_ioctl.c
index 6ff2207bd45a..a06c61f22742 100644
--- a/drivers/scsi/scsi_ioctl.c
+++ b/drivers/scsi/scsi_ioctl.c
@@ -347,6 +347,8 @@ static int scsi_fill_sghdr_rq(struct scsi_device *sdev, struct request *rq,
 {
 	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))