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From: Johannes Thumshirn <jthumshirn@suse.de>
Subject: Re: [REGRESSION] 28676d869bbb (scsi: sg: check for valid direction
before starting the request) breaks mtx tape library control
To: Jason L Tibbitts III <tibbs@math.uh.edu>
Cc: Doug Gilbert <dgilbert@interlog.com>, linux-scsi@vger.kernel.org,
linux-kernel@vger.kernel.org, dvyukov@google.com, hare@suse.com,
hch@lst.de, martin.petersen@oracle.com
Date: Wed, 26 Jul 2017 09:39:34 +0200 (6 hours, 57 minutes ago)
On Tue, Jul 25, 2017 at 01:25:07PM -0500, Jason L Tibbitts III wrote:
> >>>>> "JT" == Johannes Thumshirn <jthumshirn@suse.de> writes:
> ioctl(3, SG_IO, {interface_id='S', dxfer_direction=SG_DXFER_TO_DEV, cmd_len=12, cmdp="\xa5\x00\x00\x00\x00\x01\x03\xe9\x00\x00\x00\x00", mx_sb_len=20, iovec_count=0, dxfer_len=0, timeout=300000, flags=0, dxferp=NULL, status=0, masked_status=0, msg_status=0, sb_len_wr=0, sbp="", host_status=0, driver_status=0, resid=0, duration=0, info=0}) = -1 EINVAL (Invalid argument)
[...]
case SG_DXFER_TO_DEV:
case SG_DXFER_TO_FROM_DEV:
if (!hp->dxferp)
return false;
return true;
So here we go, dxfer_direction is SG_DXFER_TO_DEV, dxfer_len is 0 and dxferp
is NULL. We bail out because dxferp is NULL here.
I only looked at sg_write() and not sg_new_write() which is called by the
SG_IO path not the fops->write() path.
It's probably best to just check for dxfer_len <= 2^28 to be valid as Doug
suggested:
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 4fe606b000b4..d7ff71e0c85c 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -751,29 +751,6 @@ sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
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_TO_DEV:
- case SG_DXFER_FROM_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)
@@ -800,7 +771,7 @@ sg_common_write(Sg_fd * sfp, Sg_request * srp,
"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);
--
Johannes Thumshirn Storage
jthumshirn@suse.de +49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Felix Imendörffer, Jane Smithard, Graham Norton
HRB 21284 (AG Nürnberg)
Key fingerprint = EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850
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