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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Nisar Sayed , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH net v2] net: usb: lan78xx: reject invalid EEPROM write requests Date: Sat, 10 Oct 2026 23:32:48 +0200 Message-ID: <20261010213248.15938-1-stefanomunari.sm@gmail.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The runtime PM handling removed the -EINVAL return for invalid EEPROM/OTP write requests. These requests now return zero from a successful usb_autopm_get_interface() call, even though no data is written. Set ret to -EINVAL for invalid requests while preserving the runtime PM reference release. Fixes: 8a7ffeb795f8 ("lan78xx: Fix for eeprom read/write when device auto suspend") Signed-off-by: Stefano Munari Reviewed-by: Nicolai Buchwitz Tested-by: Nicolai Buchwitz # Raspberry Pi 3B+ (LAN7515) --- Changes in v2: - Add braces to all branches of the if/else chain as suggested by Andrew. - Add Nicolai's Reviewed-by and Tested-by tags. v1: https://lore.kernel.org/r/20261009005702.164936-1-stefanomunari.sm@gmail.com Tested on a Raspberry Pi 3 Model B+ with the onboard Ethernet controller, using raspberrypi/linux commit bba53a117a4a on the rpi-6.6.y branch as the baseline. ethtool -E eth0 magic 0 offset 0 length 1 value 0 The command succeeds without the patch and reports "Invalid argument" with the patch applied. --- drivers/net/usb/lan78xx.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c index 5655941f1478..2fed938fc7f4 100644 --- a/drivers/net/usb/lan78xx.c +++ b/drivers/net/usb/lan78xx.c @@ -1712,13 +1712,16 @@ static int lan78xx_ethtool_set_eeprom(struct net_device *netdev, /* Invalid EEPROM_INDICATOR at offset zero will result in a failure * to load data from EEPROM */ - if (ee->magic == LAN78XX_EEPROM_MAGIC) + if (ee->magic == LAN78XX_EEPROM_MAGIC) { ret = lan78xx_write_raw_eeprom(dev, ee->offset, ee->len, data); - else if ((ee->magic == LAN78XX_OTP_MAGIC) && + } else if ((ee->magic == LAN78XX_OTP_MAGIC) && (ee->offset == 0) && (ee->len == 512) && - (data[0] == OTP_INDICATOR_1)) + (data[0] == OTP_INDICATOR_1)) { ret = lan78xx_write_raw_otp(dev, ee->offset, ee->len, data); + } else { + ret = -EINVAL; + } usb_autopm_put_interface(dev->intf); -- 2.55.0