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| author | Xie He <xie.he.0141@gmail.com> | 2021-03-10 23:23:09 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-05-22 10:59:34 +0200 |
| commit | 8e352671cfb860fd1ef5b5e87ff372a212e3bebf (patch) | |
| tree | c9d9de726cd6e741dabb921ad0e852978875cf2c /arch/powerpc | |
| parent | eda1827e6dbfa1db4be06f7e01f862549d711b04 (diff) | |
net: lapbether: Prevent racing when checking whether the netif is running
[ Upstream commit 5acd0cfbfbb5a688da1bfb1a2152b0c855115a35 ]
There are two "netif_running" checks in this driver. One is in
"lapbeth_xmit" and the other is in "lapbeth_rcv". They serve to make
sure that the LAPB APIs called in these functions are called before
"lapb_unregister" is called by the "ndo_stop" function.
However, these "netif_running" checks are unreliable, because it's
possible that immediately after "netif_running" returns true, "ndo_stop"
is called (which causes "lapb_unregister" to be called).
This patch adds locking to make sure "lapbeth_xmit" and "lapbeth_rcv" can
reliably check and ensure the netif is running while doing their work.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Xie He <xie.he.0141@gmail.com>
Acked-by: Martin Schiller <ms@dev.tdt.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'arch/powerpc')
0 files changed, 0 insertions, 0 deletions