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([2408:8417:d50:4775:4566:2520:8878:87d4]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82f8ebe41cfsm9351203b3a.43.2026.04.19.19.46.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 19 Apr 2026 19:46:17 -0700 (PDT) From: Guangshuo Li To: Rob Herring , Saravana Kannan , Luca Ceresoli , Maxime Ripard , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Guangshuo Li , stable@vger.kernel.org Subject: [PATCH v2] drm/bridge: imx8qxp-pxl2dpi: avoid of_node_put() on ERR_PTR() Date: Mon, 20 Apr 2026 10:45:59 +0800 Message-ID: <20260420024559.114664-1-lgs201920130244@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" imx8qxp_pxl2dpi_get_available_ep_from_port() may return ERR_PTR(-ENODEV) or ERR_PTR(-EINVAL). imx8qxp_pxl2dpi_find_next_bridge() stores that value in a __free(device_node) variable and then immediately checks IS_ERR(ep). On the error path, returning from the function triggers the cleanup handler for __free(device_node). Since the device_node cleanup helper only checks for NULL before calling of_node_put(), this results in of_node_put(ERR_PTR(...)), which may lead to an invalid kobject_put() dereference and crash the kernel. Fix it by avoiding __free(device_node) for the endpoint pointer and releasing it explicitly after obtaining the remote port parent. This issue was found by a custom static analysis tool. Fixes: ceea3f7806a10 ("drm/bridge: imx8qxp-pxl2dpi: simplify put of device_= node pointers") Cc: stable@vger.kernel.org Signed-off-by: Guangshuo Li --- v2: - Fix DEFINE_FREE(device_node, ...) directly include/linux/of.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/of.h b/include/linux/of.h index 2b95777f16f6..600a6e8418bb 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -135,7 +135,7 @@ static inline struct device_node *of_node_get(struct de= vice_node *node) } static inline void of_node_put(struct device_node *node) { } #endif /* !CONFIG_OF_DYNAMIC */ -DEFINE_FREE(device_node, struct device_node *, if (_T) of_node_put(_T)) +DEFINE_FREE(device_node, struct device_node *, if (_T && !IS_ERR(_T)) of_n= ode_put(_T)) =20 /* Pointer for first entry in chain of all nodes. */ extern struct device_node *of_root; --=20 2.43.0