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[84.115.213.103]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-36638f86566sm11110573f8f.64.2024.06.24.14.10.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 24 Jun 2024 14:10:17 -0700 (PDT) From: Javier Carrasco Date: Mon, 24 Jun 2024 23:10:06 +0200 Subject: [PATCH] usb: core: add missing of_node_put() in usb_of_has_devices_or_graph Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240624-usb_core_of_memleak-v1-1-af6821c1a584@gmail.com> X-B4-Tracking: v=1; b=H4sIAK3geWYC/6tWKk4tykwtVrJSqFYqSi3LLM7MzwNyDHUUlJIzE vPSU3UzU4B8JSMDIxMDMyMT3dLipPjk/KLU+Py0+NzU3JzUxGxdc0tDM0MzI+MkM6NUJaDOgqL UtMwKsKnRsbW1AJ+KZjllAAAA To: Greg Kroah-Hartman , Stephen Boyd Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Javier Carrasco X-Mailer: b4 0.14-dev X-Developer-Signature: v=1; a=ed25519-sha256; t=1719263416; l=1531; i=javier.carrasco.cruz@gmail.com; s=20240312; h=from:subject:message-id; bh=zIXCk75aYHpcTxk2IWR/+FVXsSNkawGDCSBB195Y8Q0=; b=+ByHjcUALzgzweObJ0Ak9OHgaplq8/LAdvC9xDCh1inm6nL1TSPfW/zbMcSEfGTcAuQwNZ/oI PGEVDaWv2upBwgyNRcBV6e447rk2NwklbZh7a14JEzGBzRbv9rWhR0b X-Developer-Key: i=javier.carrasco.cruz@gmail.com; a=ed25519; pk=lzSIvIzMz0JhJrzLXI0HAdPwsNPSSmEn6RbS+PTS9aQ= The for_each_child_of_node() macro requires an explicit call to of_node_put() on early exits to decrement the child refcount and avoid a memory leak. The child node is not required outsie the loop, and the resource must be released before the function returns. Add the missing of_node_put(). Cc: stable@vger.kernel.org Fixes: 82e82130a78b ("usb: core: Set connect_type of ports based on DT node") Signed-off-by: Javier Carrasco --- This bug was found while doing some code analysis, and I could not test it with real hardware. Although the issue and it solution are straightforward, any validation beyond compilation and static analysis is always welcome. --- drivers/usb/core/of.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) --- base-commit: 62c97045b8f720c2eac807a5f38e26c9ed512371 change-id: 20240624-usb_core_of_memleak-79161623b62e Best regards, diff --git a/drivers/usb/core/of.c b/drivers/usb/core/of.c index f1a499ee482c..763e4122ed5b 100644 --- a/drivers/usb/core/of.c +++ b/drivers/usb/core/of.c @@ -84,9 +84,12 @@ static bool usb_of_has_devices_or_graph(const struct usb_device *hub) if (of_graph_is_present(np)) return true; - for_each_child_of_node(np, child) - if (of_property_present(child, "reg")) + for_each_child_of_node(np, child) { + if (of_property_present(child, "reg")) { + of_node_put(child); return true; + } + } return false; }