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27 March 2024, 02:37:15 UTC
Revision 14a0d635d18d0fb552dcc979d6d25106e6541f2e authored by Oliver Neukum on 26 March 2014, 13:32:51 UTC, committed by David S. Miller on 27 March 2014, 18:59:10 UTC 
usbnet: include wait queue head in device structure
 
This fixes a race which happens by freeing an object on the stack.
Quoting Julius:
> The issue is
> that it calls usbnet_terminate_urbs() before that, which temporarily
> installs a waitqueue in dev->wait in order to be able to wait on the
> tasklet to run and finish up some queues. The waiting itself looks
> okay, but the access to 'dev->wait' is totally unprotected and can
> race arbitrarily. I think in this case usbnet_bh() managed to succeed
> it's dev->wait check just before usbnet_terminate_urbs() sets it back
> to NULL. The latter then finishes and the waitqueue_t structure on its
> stack gets overwritten by other functions halfway through the
> wake_up() call in usbnet_bh().

The fix is to just not allocate the data structure on the stack.
As dev->wait is abused as a flag it also takes a runtime PM change
to fix this bug.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Reported-by: Grant Grundler <grundler@google.com>
Tested-by: Grant Grundler <grundler@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent 681daee
History
Tip revision: 14a0d635d18d0fb552dcc979d6d25106e6541f2e authored by Oliver Neukum on 26 March 2014, 13:32:51 UTC
usbnet: include wait queue head in device structure
Tip revision: 14a0d63
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usr
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.gitignore -rw-r--r-- 1.1 KB
.mailmap -rw-r--r-- 4.4 KB
COPYING -rw-r--r-- 18.3 KB
CREDITS -rw-r--r-- 93.3 KB
Kbuild -rw-r--r-- 2.5 KB
Kconfig -rw-r--r-- 252 bytes
MAINTAINERS -rw-r--r-- 267.3 KB
Makefile -rw-r--r-- 49.1 KB
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REPORTING-BUGS -rw-r--r-- 7.3 KB

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