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From e3eb7dd47bd4806f00e104eb6da092c435f9fb21 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Peter=20M=C3=BCnster?= <pm@a16n.net>
Date: Wed, 24 Apr 2024 15:51:52 +0200
Subject: net: b44: set pause params only when interface is up
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
From: Peter Münster <pm@a16n.net>
commit e3eb7dd47bd4806f00e104eb6da092c435f9fb21 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: 1da177e4c3f4 (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>
---
drivers/net/ethernet/broadcom/b44.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
--- a/drivers/net/ethernet/broadcom/b44.c
+++ b/drivers/net/ethernet/broadcom/b44.c
@@ -2009,12 +2009,14 @@ static int b44_set_pauseparam(struct net
bp->flags |= B44_FLAG_TX_PAUSE;
else
bp->flags &= ~B44_FLAG_TX_PAUSE;
- if (bp->flags & B44_FLAG_PAUSE_AUTO) {
- b44_halt(bp);
- b44_init_rings(bp);
- b44_init_hw(bp, B44_FULL_RESET);
- } else {
- __b44_set_flow_ctrl(bp, bp->flags);
+ if (netif_running(dev)) {
+ if (bp->flags & B44_FLAG_PAUSE_AUTO) {
+ b44_halt(bp);
+ b44_init_rings(bp);
+ b44_init_hw(bp, B44_FULL_RESET);
+ } else {
+ __b44_set_flow_ctrl(bp, bp->flags);
+ }
}
spin_unlock_irq(&bp->lock);
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