linux-kernel - [55/66] [SCSI] sd name space exhaustion causes system hang

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Message-Id: <20101119220126.711134310@clark.site>
Date:	Fri, 19 Nov 2010 14:01:26 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Michael Reed <mdr@....com>,
	James Bottomley <James.Bottomley@...e.de>
Subject: [55/66] [SCSI] sd name space exhaustion causes system hang

2.6.36-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Michael Reed <mdr@....com>

commit 1a03ae0f556a931aa3747b70e44b78308f5b0590 upstream.

Following a site power outage which re-enabled all the ports on my FC
switches, my system subsequently booted with far too many luns!  I had
let it run hoping it would make multi-user.  It didn't.  :(  It hung solid
after exhausting the last sd device, sdzzz, and attempting to create sdaaaa
and beyond.  I was unable to get a dump.

Discovered using a 2.6.32.13 based system.

correct this by detecting when the last index is utilized and failing
the sd probe of the device.  Patch applies to scsi-misc-2.6.

Signed-off-by: Michael Reed <mdr@....com>
Signed-off-by: James Bottomley <James.Bottomley@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/scsi/sd.c |   15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -2252,11 +2252,10 @@ static void sd_probe_async(void *data, a
 	index = sdkp->index;
 	dev = &sdp->sdev_gendev;
 
-	if (index < SD_MAX_DISKS) {
-		gd->major = sd_major((index & 0xf0) >> 4);
-		gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
-		gd->minors = SD_MINORS;
-	}
+	gd->major = sd_major((index & 0xf0) >> 4);
+	gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
+	gd->minors = SD_MINORS;
+
 	gd->fops = &sd_fops;
 	gd->private_data = &sdkp->driver;
 	gd->queue = sdkp->device->request_queue;
@@ -2346,6 +2345,12 @@ static int sd_probe(struct device *dev)
 	if (error)
 		goto out_put;
 
+	if (index >= SD_MAX_DISKS) {
+		error = -ENODEV;
+		sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name space exhausted.\n");
+		goto out_free_index;
+	}
+
 	error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
 	if (error)
 		goto out_free_index;


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