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net: phy: Remove LED entry from LEDs list on unregister

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BugLink: https://bugs.launchpad.net/bugs/2097301

commit f50b5d74c68e551667e265123659b187a30fe3a5 upstream.

Commit c938ab4da0 ("net: phy: Manual remove LEDs to ensure correct
ordering") correctly fixed a problem with using devm_ but missed
removing the LED entry from the LEDs list.

This cause kernel panic on specific scenario where the port for the PHY
is torn down and up and the kmod for the PHY is removed.

On setting the port down the first time, the assosiacted LEDs are
correctly unregistered. The associated kmod for the PHY is now removed.
The kmod is now added again and the port is now put up, the associated LED
are registered again.
On putting the port down again for the second time after these step, the
LED list now have 4 elements. With the first 2 already unregistered
previously and the 2 new one registered again.

This cause a kernel panic as the first 2 element should have been
removed.

Fix this by correctly removing the element when LED is unregistered.

Reported-by: Daniel Golle <daniel@makrotopia.org>
Tested-by: Daniel Golle <daniel@makrotopia.org>
Cc: stable@vger.kernel.org
Fixes: c938ab4da0 ("net: phy: Manual remove LEDs to ensure correct ordering")
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20241004182759.14032-1-ansuelsmth@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
CVE-2024-50023
Signed-off-by: Manuel Diewald <manuel.diewald@canonical.com>
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
This commit is contained in:
Christian Marangi
2024-10-04 20:27:58 +02:00
committed by Mehmet Basaran
parent 747ccac03c
commit 102d9d46c2
1 changed files with 3 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/net/phy/phy_device.c
+3 -2
View File
@@ -3087,10 +3087,11 @@ static __maybe_unused int phy_led_hw_is_supported(struct led_classdev *led_cdev,
static void phy_leds_unregister(struct phy_device *phydev)
{
struct phy_led *phyled;
struct phy_led *phyled, *tmp;
list_for_each_entry(phyled, &phydev->leds, list) {
list_for_each_entry_safe(phyled, tmp, &phydev->leds, list) {
led_classdev_unregister(&phyled->led_cdev);
list_del(&phyled->list);
}
}