[PATCH] net: eth-uclass: change state before stop() in eth_halt()

[Niel Fourie <lusus@denx.de>]

In eth_halt(), change the private uclass state before calling
stop() instead of afterwards, to avoid writing to memory which
may have been freed during stop().

In the ethernet gadget implementation, the gadget device gets
probed during start() and removed during stop(), which includes
freeing `uclass_priv_` to which `priv` is pointing. Writing to
`priv` after stop() may corrupt the `fd` member of `struct
malloc_chunk`, which represents the freed block, and could cause
hard-to-debug crashes on subsequent calls to malloc()/free().

Signed-off-by: Niel Fourie <lusus@denx.de>
Cc: Ramon Fried <rfried.dev@gmail.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Lukasz Majewski <lukma@denx.de>
---
 net/eth-uclass.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/eth-uclass.c b/net/eth-uclass.c
index f41da4b37b3..bc3b9751e32 100644
--- a/net/eth-uclass.c
+++ b/net/eth-uclass.c
@@ -342,9 +342,9 @@ void eth_halt(void)
 	if (!priv || !priv->running)
 		return;
 
-	eth_get_ops(current)->stop(current);
 	priv->state = ETH_STATE_PASSIVE;
 	priv->running = false;
+	eth_get_ops(current)->stop(current);
 }
 
 int eth_is_active(struct udevice *dev)
-- 
2.38.1