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| author | Nikolay Aleksandrov <nikolay@redhat.com> | 2013-09-19 15:02:35 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-10-13 14:51:07 -0700 |
| commit | f6f88d6f41938e39971a5c0fce3aa8d26d3dd9de (patch) | |
| tree | dbf36ef28dc8806b3f788cfa7267892bf8232121 /net/ipx | |
| parent | 63195262c5555dc90fde66d1be41ab102cf00adb (diff) | |
| download | kernel_samsung_smdk4412-f6f88d6f41938e39971a5c0fce3aa8d26d3dd9de.zip kernel_samsung_smdk4412-f6f88d6f41938e39971a5c0fce3aa8d26d3dd9de.tar.gz kernel_samsung_smdk4412-f6f88d6f41938e39971a5c0fce3aa8d26d3dd9de.tar.bz2 | |
netpoll: fix NULL pointer dereference in netpoll_cleanup
[ Upstream commit d0fe8c888b1fd1a2f84b9962cabcb98a70988aec ]
I've been hitting a NULL ptr deref while using netconsole because the
np->dev check and the pointer manipulation in netpoll_cleanup are done
without rtnl and the following sequence happens when having a netconsole
over a vlan and we remove the vlan while disabling the netconsole:
CPU 1 CPU2
removes vlan and calls the notifier
enters store_enabled(), calls
netdev_cleanup which checks np->dev
and then waits for rtnl
executes the netconsole netdev
release notifier making np->dev
== NULL and releases rtnl
continues to dereference a member of
np->dev which at this point is == NULL
Signed-off-by: Nikolay Aleksandrov <nikolay@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/ipx')
0 files changed, 0 insertions, 0 deletions