[openwrt/openwrt] realtek: ethernet: avoid using unitialized memory

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch openwrt-25.12:
https://git.openwrt.org/d01aa41d40e1b6f9e9a034bcae5fda322d5d0624

commit d01aa41d40e1b6f9e9a034bcae5fda322d5d0624
Author: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006 at gmx.net>
AuthorDate: Mon Jan 12 12:02:24 2026 +0100

    realtek: ethernet: avoid using unitialized memory
    
    The mac_addr variable was not zero-initialized, causing weird side effects
    when the memory contents were a valid MAC address.
    
    Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006 at gmx.net>
    Link: https://github.com/openwrt/openwrt/pull/21504
    Signed-off-by: Stijn Tintel <stijn at linux-ipv6.be>
    (cherry picked from commit 19b8d391a95d5a2fa038551a9498a9fd426dfc0e)
---
 target/linux/realtek/files-6.12/drivers/net/ethernet/rtl838x_eth.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/linux/realtek/files-6.12/drivers/net/ethernet/rtl838x_eth.c b/target/linux/realtek/files-6.12/drivers/net/ethernet/rtl838x_eth.c
index 59ae4fbb24..db53496488 100644
--- a/target/linux/realtek/files-6.12/drivers/net/ethernet/rtl838x_eth.c
+++ b/target/linux/realtek/files-6.12/drivers/net/ethernet/rtl838x_eth.c
@@ -1650,7 +1650,7 @@ static int __init rtl838x_eth_probe(struct platform_device *pdev)
 	struct resource *res, *mem;
 	phy_interface_t phy_mode;
 	struct phylink *phylink;
-	u8 mac_addr[ETH_ALEN];
+	u8 mac_addr[ETH_ALEN] = {0};
 	int err = 0, rxrings, rxringlen;
 	struct ring_b *ring;