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net: b44: set pause params only when interface is up

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commit e3eb7dd47b upstream.

b44_free_rings() accesses b44::rx_buffers (and ::tx_buffers)
unconditionally, but b44::rx_buffers is only valid when the
device is up (they get allocated in b44_open(), and deallocated
again in b44_close()), any other time these are just a NULL pointers.

So if you try to change the pause params while the network interface
is disabled/administratively down, everything explodes (which likely
netifd tries to do).

Link: https://github.com/openwrt/openwrt/issues/13789
Fixes: 1da177e4c3 (Linux-2.6.12-rc2)
Cc: stable@vger.kernel.org
Reported-by: Peter Münster <pm@a16n.net>
Suggested-by: Jonas Gorski <jonas.gorski@gmail.com>
Signed-off-by: Vaclav Svoboda <svoboda@neng.cz>
Tested-by: Peter Münster <pm@a16n.net>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Peter Münster <pm@a16n.net>
Reviewed-by: Michael Chan <michael.chan@broadcom.com>
Link: https://lore.kernel.org/r/87y192oolj.fsf@a16n.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Münster 2024-04-24 15:51:52 +02:00 committed by Greg Kroah-Hartman
parent f3a2f186a1
commit c9d5f3b5af
1 changed files with 8 additions and 6 deletions
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2
drivers/net/ethernet/broadcom/b44.c
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@ -2027,6 +2027,7 @@ static int b44_set_pauseparam(struct net_device *dev,
bp->flags |= B44_FLAG_TX_PAUSE;
else
bp->flags &= ~B44_FLAG_TX_PAUSE;
if (netif_running(dev)) {
if (bp->flags & B44_FLAG_PAUSE_AUTO) {
b44_halt(bp);
b44_init_rings(bp);
@ -2034,6 +2035,7 @@ static int b44_set_pauseparam(struct net_device *dev,
} else {
__b44_set_flow_ctrl(bp, bp->flags);
}
}
spin_unlock_irq(&bp->lock);
b44_enable_ints(bp);