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Message-ID: <lsq.1591725832.121719502@decadent.org.uk>
Date: Tue, 09 Jun 2020 19:04:32 +0100
From: Ben Hutchings <ben@...adent.org.uk>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC: akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
"" <stable@...r.kernel.org>,
"Johannes Thumshirn" <jthumshirn@...e.de>,
"Jason L Tibbitts III" <tibbs@...h.uh.edu>,
"Hannes Reinecke" <hare@...e.com>,
"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
"Doug Gilbert" <dgilbert@...erlog.com>
Subject: [PATCH 3.16 41/61] scsi: sg: only check for dxfer_len greater
than 256M
3.16.85-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Johannes Thumshirn <jthumshirn@...e.de>
commit f930c7043663188429cd9b254e9d761edfc101ce upstream.
Don't make any assumptions on the sg_io_hdr_t::dxfer_direction or the
sg_io_hdr_t::dxferp in order to determine if it is a valid request. The
only way we can check for bad requests is by checking if the length
exceeds 256M.
Signed-off-by: Johannes Thumshirn <jthumshirn@...e.de>
Fixes: 28676d869bbb (scsi: sg: check for valid direction before starting the request)
Reported-by: Jason L Tibbitts III <tibbs@...h.uh.edu>
Tested-by: Jason L Tibbitts III <tibbs@...h.uh.edu>
Suggested-by: Doug Gilbert <dgilbert@...erlog.com>
Cc: Doug Gilbert <dgilbert@...erlog.com>
Cc: <stable@...r.kernel.org>
Reviewed-by: Hannes Reinecke <hare@...e.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
[bwh: Backported to 3.16: Include <linux/sizes.h>]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
drivers/scsi/sg.c | 31 +------------------------------
1 file changed, 1 insertion(+), 30 deletions(-)
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -54,6 +54,7 @@ static int sg_version_num = 30534; /* 2
#include <linux/atomic.h>
#include <linux/ratelimit.h>
#include <linux/cred.h> /* for sg_check_file_access() */
+#include <linux/sizes.h>
#include "scsi.h"
#include <scsi/scsi_dbg.h>
@@ -788,35 +789,6 @@ sg_new_write(Sg_fd *sfp, struct file *fi
return count;
}
-static bool sg_is_valid_dxfer(sg_io_hdr_t *hp)
-{
- switch (hp->dxfer_direction) {
- case SG_DXFER_NONE:
- if (hp->dxferp || hp->dxfer_len > 0)
- return false;
- return true;
- case SG_DXFER_FROM_DEV:
- /*
- * for SG_DXFER_FROM_DEV we always set dxfer_len to > 0. dxferp
- * can either be NULL or != NULL so there's no point in checking
- * it either. So just return true.
- */
- return true;
- case SG_DXFER_TO_DEV:
- case SG_DXFER_TO_FROM_DEV:
- if (!hp->dxferp || hp->dxfer_len == 0)
- return false;
- return true;
- case SG_DXFER_UNKNOWN:
- if ((!hp->dxferp && hp->dxfer_len) ||
- (hp->dxferp && hp->dxfer_len == 0))
- return false;
- return true;
- default:
- return false;
- }
-}
-
static int
sg_common_write(Sg_fd * sfp, Sg_request * srp,
unsigned char *cmnd, int timeout, int blocking)
@@ -836,7 +808,7 @@ sg_common_write(Sg_fd * sfp, Sg_request
SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
(int) cmnd[0], (int) hp->cmd_len));
- if (!sg_is_valid_dxfer(hp))
+ if (hp->dxfer_len >= SZ_256M)
return -EINVAL;
k = sg_start_req(srp, cmnd);
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