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 2A0178F57 for ; Mon, 13 Feb 2023 15:00:59 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7A74BC433D2; Mon, 13 Feb 2023 15:00:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1676300459; bh=eQ6m5MksM5xD3jyQcWn7negpAGUN8T8KkDH+N0f906s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=J/MWJ1dUj3jyI61BBzh+4vBE7RLyI9hreUnCGS8KCCItFNTcu5nSlF9QOEmbWTEVP RA+BBDHt6jGealk3YIne5JXs/LJohXjia/84DhJltt5nnnQxjp614n7mnX988KNBUf KRDECl7ttl+5f5gKPqEyZCcCfg8qyOaKuwE/KSjc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Andre Kalb , Simon Horman , Jakub Kicinski , Sasha Levin Subject: [PATCH 5.10 022/139] net: phy: dp83822: Fix null pointer access on DP83825/DP83826 devices Date: Mon, 13 Feb 2023 15:49:27 +0100 Message-Id: <20230213144746.815463306@linuxfoundation.org> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230213144745.696901179@linuxfoundation.org> References: <20230213144745.696901179@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Andre Kalb [ Upstream commit 422ae7d9c7221e8d4c8526d0f54106307d69d2dc ] The probe() function is only used for the DP83822 PHY, leaving the private data pointer uninitialized for the smaller DP83825/26 models. While all uses of the private data structure are hidden in 82822 specific callbacks, configuring the interrupt is shared across all models. This causes a NULL pointer dereference on the smaller PHYs as it accesses the private data unchecked. Verifying the pointer avoids that. Fixes: 5dc39fd5ef35 ("net: phy: DP83822: Add ability to advertise Fiber connection") Signed-off-by: Andre Kalb Reviewed-by: Simon Horman Link: https://lore.kernel.org/r/Y9FzniUhUtbaGKU7@pc6682 Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/net/phy/dp83822.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/net/phy/dp83822.c b/drivers/net/phy/dp83822.c index db651649e0b8..81412999445d 100644 --- a/drivers/net/phy/dp83822.c +++ b/drivers/net/phy/dp83822.c @@ -247,7 +247,8 @@ static int dp83822_config_intr(struct phy_device *phydev) DP83822_ENERGY_DET_INT_EN | DP83822_LINK_QUAL_INT_EN); - if (!dp83822->fx_enabled) + /* Private data pointer is NULL on DP83825/26 */ + if (!dp83822 || !dp83822->fx_enabled) misr_status |= DP83822_ANEG_COMPLETE_INT_EN | DP83822_DUP_MODE_CHANGE_INT_EN | DP83822_SPEED_CHANGED_INT_EN; @@ -267,7 +268,8 @@ static int dp83822_config_intr(struct phy_device *phydev) DP83822_PAGE_RX_INT_EN | DP83822_EEE_ERROR_CHANGE_INT_EN); - if (!dp83822->fx_enabled) + /* Private data pointer is NULL on DP83825/26 */ + if (!dp83822 || !dp83822->fx_enabled) misr_status |= DP83822_ANEG_ERR_INT_EN | DP83822_WOL_PKT_INT_EN; -- 2.39.0