p54usb: fix nasty use after free
commite2fe154e918276e900067a9d1d3a6a963faee041
authorChristian Lamparter <chunkeey@web.de>
Mon, 19 Jan 2009 23:27:57 +0000 (20 00:27 +0100)
committerJohn W. Linville <linville@tuxdriver.com>
Thu, 22 Jan 2009 18:55:02 +0000 (22 13:55 -0500)
tree22936f2b3784c4d89c4f1e2263b528167f42e683
parent12da401e0d616f738c8b8a368d1f63f365cc78e4
p54usb: fix nasty use after free

In theory, the firmware acks the received a data frame, before signaling the driver to free it again.
However Artur Skawina <art.08.09@gmail.com> has shown that it can happen in reverse order as well.
This is very bad and could lead to memory corruptions, oopses and panics.

Thanks to Artur Skawina <art.08.09@gmail.com> for reporting and debugging this issue.

Signed-off-by: Christian Lamparter <chunkeey@web.de>
Tested-by: Artur Skawina <art.08.09@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
drivers/net/wireless/p54/p54usb.c