USB: Check results of dma_map_single

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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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Larry Finger 2009-11-05 10:37:03 -06:00 • committed by Greg Kroah-Hartman

parent 796c8c7880

commit 85e034fdff

1 changed files with 10 additions and 4 deletions

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14

drivers/usb/core/hcd.c

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