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Tue, 04 Aug 2026 21:36:54 -0700 (PDT) Received: from localhost.localdomain ([152.59.182.249]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-315863b0bfesm11262346eec.3.2026.08.04.21.36.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 04 Aug 2026 21:36:54 -0700 (PDT) From: Krishan Singh To: linux@armlinux.org.uk Cc: andrew@lunn.ch, hkallweit1@gmail.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Krishan Singh Subject: [PATCH] net: sfp: Fix memory leak of hwmon_name on hwmon registration failure Date: Wed, 5 Aug 2026 10:06:43 +0530 Message-Id: <20260805043643.194976-1-krishanmohan298@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit hwmon_sanitize_name() allocates sfp->hwmon_name before hwmon_device_register_with_info() is called. If the registration fails, sfp->hwmon_dev is left as an error pointer while sfp->hwmon_name remains allocated. Later, when the SFP module is removed, sfp_hwmon_remove() is still called. However, it frees sfp->hwmon_name only when !IS_ERR_OR_NULL(sfp->hwmon_dev) is true. Since sfp->hwmon_dev is an error pointer in the failure case, the cleanup block is skipped and hwmon_name is leaked. Fix this by cleaning up hwmon_name independently of hwmon_dev. Continue to unregister the hwmon device only when hwmon_dev is valid, but free hwmon_name whenever it is a valid allocated pointer. Fixes: 3f118c449c8e ("net: sfp: use hwmon_sanitize_name()") Suggested-by: Andrew Lunn Signed-off-by: Krishan Singh --- drivers/net/phy/sfp.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c index f52020673..bfa2b821f 100644 --- a/drivers/net/phy/sfp.c +++ b/drivers/net/phy/sfp.c @@ -1916,7 +1916,11 @@ static void sfp_hwmon_remove(struct sfp *sfp) if (!IS_ERR_OR_NULL(sfp->hwmon_dev)) { hwmon_device_unregister(sfp->hwmon_dev); sfp->hwmon_dev = NULL; + } + + if (!IS_ERR_OR_NULL(sfp->hwmon_name)) { kfree(sfp->hwmon_name); + sfp->hwmon_name = NULL; } } -- 2.34.1