This is a note to let you know that I've just added the patch titled
net: phy: fix phy_read_poll_timeout argument type in genphy_loopback
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-phy-fix-phy_read_poll_timeout-argument-type-in-g.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 8af7b1b2a81b7a14d427d312fc1bca8516846c56
Author: Nikita Kiryushin <kiryushin@xxxxxxxx>
Date: Fri Mar 15 20:50:52 2024 +0300
net: phy: fix phy_read_poll_timeout argument type in genphy_loopback
[ Upstream commit 32fa4366cc4da1c97b725a0066adf43c6b298f37 ]
read_poll_timeout inside phy_read_poll_timeout can set val negative
in some cases (for example, __mdiobus_read inside phy_read can return
-EOPNOTSUPP).
Supposedly, commit 4ec732951702 ("net: phylib: fix phy_read*_poll_timeout()")
should fix problems with wrong-signed vals, but I do not see how
as val is sent to phy_read as is and __val = phy_read (not val)
is checked for sign.
Change val type for signed to allow better error handling as done in other
phy_read_poll_timeout callers. This will not fix any error handling
by itself, but allows, for example, to modify cond with appropriate
sign check or check resulting val separately.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Fixes: 014068dcb5b1 ("net: phy: genphy_loopback: add link speed configuration")
Signed-off-by: Nikita Kiryushin <kiryushin@xxxxxxxx>
Reviewed-by: Russell King (Oracle) <rmk+kernel@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240315175052.8049-1-kiryushin@xxxxxxxx
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index c1d6ebf12ec74..523436690adef 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -2645,8 +2645,8 @@ EXPORT_SYMBOL(genphy_resume);
int genphy_loopback(struct phy_device *phydev, bool enable)
{
if (enable) {
- u16 val, ctl = BMCR_LOOPBACK;
- int ret;
+ u16 ctl = BMCR_LOOPBACK;
+ int ret, val;
if (phydev->speed == SPEED_1000)
ctl |= BMCR_SPEED1000;
