From: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Date: Tue, 17 Nov 2009 22:10:11 +0000 (-0800)
Subject: [SCSI] fix crash when disconnecting usb storage
X-Git-Tag: v2.6.32~31^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4e46bf89972b9d98a9f282a9fed2359756a5e34e;p=pandora-kernel.git

[SCSI] fix crash when disconnecting usb storage

__scsi_remove_device() in scsi_forget_host() is executed out of scan_mutex
and races with scsi_destroy_sdev() <- scsi_sysfs_add_devices() <-
scsi_finish_async_scan().  The result is use after free and/or double
free, oops.

The fix is simple, move scsi_forget_host() under scan_mutex.

scsi_forget_host() is just sequence of __scsi_remove_device().  All
another calls of __scsi_remove_device() are made under scan_mutex.  So
that it is safe.

Signed-off-by: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
---

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