From: Larry Finger <Larry.Finger@lwfinger.net>
Date: Thu, 5 Nov 2009 16:37:03 +0000 (-0600)
Subject: USB: Check results of dma_map_single
X-Git-Tag: v2.6.33-rc1~315^2~75
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=85e034fdff2af6befc55904f3ab9cc5aa31be8fe;p=pandora-kernel.git

USB: Check results of dma_map_single

In map_urb_for_dma(), the DMA address returned by dma_map_single()
is not checked to determine if it is legal. This lack of checking
contributed to a problem with the libertas wireless driver
(http://marc.info/?l=linux-wireless&m=125695331205062&w=2). The
difficulty was not detected until the buffer was unmapped. By this time
memory corruption had occurred.

The situation is fixed by testing the returned DMA address, and
returning -EAGAIN if the address is invalid.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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