From: Kévin L'hôpital kevin.lhopital@savoirfairelinux.com
[ Upstream commit 4469c0c5b14a0919f5965c7ceac96b523eb57b79 ]
The phy_get_internal_delay function could try to access to an empty array in the case that the driver is calling phy_get_internal_delay without defining delay_values and rx-internal-delay-ps or tx-internal-delay-ps is defined to 0 in the device-tree. This will lead to "unable to handle kernel NULL pointer dereference at virtual address 0". To avoid this kernel oops, the test should be delay
= 0. As there is already delay < 0 test just before, the test could
only be size == 0.
Fixes: 92252eec913b ("net: phy: Add a helper to return the index for of the internal delay") Co-developed-by: Enguerrand de Ribaucourt enguerrand.de-ribaucourt@savoirfairelinux.com Signed-off-by: Enguerrand de Ribaucourt enguerrand.de-ribaucourt@savoirfairelinux.com Signed-off-by: Kévin L'hôpital kevin.lhopital@savoirfairelinux.com Reviewed-by: Russell King (Oracle) rmk+kernel@armlinux.org.uk Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/phy/phy_device.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c index 944f76e6fc8eb..45b07004669d6 100644 --- a/drivers/net/phy/phy_device.c +++ b/drivers/net/phy/phy_device.c @@ -2893,7 +2893,7 @@ s32 phy_get_internal_delay(struct phy_device *phydev, struct device *dev, if (delay < 0) return delay;
- if (delay && size == 0) + if (size == 0) return delay;
if (delay < delay_values[0] || delay > delay_values[size - 1]) {