From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 982F15CDE7; Sun, 24 Mar 2024 22:40:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711320020; cv=none; b=HulcfdiclDH/kfDQ/lxj3PDL7SOYIBODR/tR7fuqORk8MDFLvmGaqyo+OXKZGZszA/3tbEDI+WAUmMRS6URUEyISCdZTJc9s0IjVyBRWZR11BSew8ZHXuJYc4p6iz6lYHphCh4JJQbJploic5JEJzBUYO0MwOFQyTpb9JF6UdU4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711320020; c=relaxed/simple; bh=HgEcKG5Vx/SjBZU6lXviRdeplvbHJ8xqQ+Kn3L/pG18=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=fzYr1Fdyqt52ZLy1YzP+9t3NTQJaPO7xiV7MysFsa2EDqVDyffiZoDa4MG3EuXL0pCiRBBGeqVoYOTg0GZ+TZUEjjli9tCkw8wmQ961C4/JrssxLdI8scy/I7T0GxRYchw/FEV85grEfTUFsLLCx+mHOrWS49lzVvaqnLw+zryc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=HQL0JLHD; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="HQL0JLHD" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AB195C433C7; Sun, 24 Mar 2024 22:40:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1711320020; bh=HgEcKG5Vx/SjBZU6lXviRdeplvbHJ8xqQ+Kn3L/pG18=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HQL0JLHDes9zlR4EmKxRBWiMIe+FQjOwNXYBMByuNNoS62Rk6IOtNgAztlgdVbXZZ j2kUwc9sel3UZdjSKOuKQJEj7v+73TtBjLKG2D+doOOnme1I2dCW86gzDuU+lvwTND TePcZeOfnaWamfUVk9ZWU0828OmTyTo0SAggkSahqtdfooYDS4FkmMDi7gl65jm84A 536i4cnF+ncTcMDuttENiVNKEBVFWGc3fjprEA3K77+ytaVwA91G80wzwtLXBytYzd E71enE16l7YQfWd2AhYOa6XDFme868EwlWsoDJxOLM+aq5ynTyJg2HeEGkoNBUa18R I4L3qAQO0z6TA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: =?UTF-8?q?K=C3=A9vin=20L=27h=C3=B4pital?= , Enguerrand de Ribaucourt , Russell King , "David S . Miller" , Sasha Levin Subject: [PATCH 6.8 328/715] net: phy: fix phy_get_internal_delay accessing an empty array Date: Sun, 24 Mar 2024 18:28:27 -0400 Message-ID: <20240324223455.1342824-329-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240324223455.1342824-1-sashal@kernel.org> References: <20240324223455.1342824-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit From: Kévin L'hôpital [ 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 Signed-off-by: Enguerrand de Ribaucourt Signed-off-by: Kévin L'hôpital Reviewed-by: Russell King (Oracle) Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- 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 3611ea64875ef..3ad9bbf65cbeb 100644 --- a/drivers/net/phy/phy_device.c +++ b/drivers/net/phy/phy_device.c @@ -2959,7 +2959,7 @@ 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]) { -- 2.43.0