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Mon, 04 May 2026 09:47:16 -0700 (PDT) Received: from i4-gl-tmk5904.ad.psu.edu ([130.203.156.186]) by smtp.gmail.com with ESMTPSA id af79cd13be357-8fc2cd04de9sm1116747885a.44.2026.05.04.09.47.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 04 May 2026 09:47:15 -0700 (PDT) From: Yuho Choi To: Paul Walmsley , Aaro Koskinen , Andreas Kemnade , Kevin Hilman , Roger Quadros , Tony Lindgren , Russell King Cc: linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Yuho Choi Subject: [PATCH v1] ARM: OMAP2+: Fix OF node reference leaks in omap_hwmod Date: Mon, 4 May 2026 12:47:11 -0400 Message-ID: <20260504164711.2854116-1-dbgh9129@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: 8bit The OF helpers that return device nodes acquire references that must be released by the caller. _init() leaks the "ocp" bus node returned by of_find_node_by_name() on all paths after lookup, and also leaks the child returned by of_get_next_child() when parsing module flags. Route the post-lookup returns through a common cleanup path and release the child after use. omap_hwmod_setup_earlycon_flags() leaks the /chosen node and the UART node resolved from stdout-path. Track them separately and drop both references after use. Fixes: 1aa8f0cb19e5 ("ARM: OMAP2+: Remove unused legacy code for interconnects") Fixes: 4f2122473363 ("ARM: OMAP2+: Check also the first dts child for hwmod flags") Fixes: 8dd6666f4937 ("ARM: OMAP2+: omap_hwmod: Add support for earlycon") Signed-off-by: Yuho Choi --- arch/arm/mach-omap2/omap_hwmod.c | 26 ++++++++++++++++++-------- 1 file changed, 18 insertions(+), 8 deletions(-) diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c index 974107ff18b4..03cd523dff87 100644 --- a/arch/arm/mach-omap2/omap_hwmod.c +++ b/arch/arm/mach-omap2/omap_hwmod.c @@ -2331,13 +2331,15 @@ static int __init _init(struct omap_hwmod *oh, void *data) if (r < 0) { WARN(1, "omap_hwmod: %s: doesn't have mpu register target base\n", oh->name); - return 0; + r = 0; + goto out_put_node; } r = _init_clocks(oh, np); if (r < 0) { WARN(1, "omap_hwmod: %s: couldn't init clocks\n", oh->name); - return -EINVAL; + r = -EINVAL; + goto out_put_node; } if (np) { @@ -2345,13 +2347,19 @@ static int __init _init(struct omap_hwmod *oh, void *data) parse_module_flags(oh, np); child = of_get_next_child(np, NULL); - if (child) + if (child) { parse_module_flags(oh, child); + of_node_put(child); + } } oh->_state = _HWMOD_STATE_INITIALIZED; - return 0; + r = 0; + +out_put_node: + of_node_put(bus); + return r; } /** @@ -3608,13 +3616,13 @@ int omap_hwmod_init_module(struct device *dev, #ifdef CONFIG_SERIAL_EARLYCON static void __init omap_hwmod_setup_earlycon_flags(void) { - struct device_node *np; + struct device_node *np, *chosen; struct omap_hwmod *oh; const char *uart; - np = of_find_node_by_path("/chosen"); - if (np) { - uart = of_get_property(np, "stdout-path", NULL); + chosen = of_find_node_by_path("/chosen"); + if (chosen) { + uart = of_get_property(chosen, "stdout-path", NULL); if (uart) { np = of_find_node_by_path(uart); if (np) { @@ -3629,8 +3637,10 @@ static void __init omap_hwmod_setup_earlycon_flags(void) if (oh) oh->flags |= DEBUG_OMAPUART_FLAGS; } + of_node_put(np); } } + of_node_put(chosen); } #endif -- 2.43.0