From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 DC9E1494817; Fri, 9 Oct 2026 09:41:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791538904; cv=none; b=kYDFfKuQK9xBK/JlvTfyFZ2XqBJwP7/7GQ6TUIvzeaiV2OCTJAE2AsOLSn98XNaoj6sLQIH65GxRR7eXF22nkAikxmCZGVIHmXR3A34IXavjhU1J6WEH9NOlgE5E3bhFBl27obbPKlFX2m/WAKW0pb5J9GyDZJn+y6YmBWdGH6A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791538904; c=relaxed/simple; bh=u9EmbQR0cN1WRZrECL9onPDnYf/Gka3OBpqjOOETwP8=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=dKMVsOwhWrlZHPYylI5IaHGEmprIMKi9SBdrvW5TiBe1+xJAnAg+KzJGtFttq0W+HABBTZ0AZ0K504YLiQ+GePFJcWmv3pnCVSlTGWwuOYKKtHIniJaXnOqMjkFWMvmg6+oA7BzFhvUTPksOMki8TBR8mmXrnxZLzsOE6sX/zcU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=mE+2N9Oo; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="mE+2N9Oo" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 293F01F00899; Fri, 9 Oct 2026 09:41:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1791538899; bh=SHucz3qY6+BH4YMQ0K3equMWZeHDs8Rh369diC5si0E=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=mE+2N9OoBdEYpunteW+EXEQNOBKakLAPk4Xxbo6gd8peEvPD1svewzIVjRl3uia9f nS9VyTlWHDrf8krWW5c/YAWH3cyxbs8hGZXTXNCU7HcRT3z/Qc89p8Xl8hi6Ur1O83 6b24gQOjgczrQ+V8T+4i5rDQHqxFL2okRO47JO9ojvZHi0jxaWN+i07vZXd/BQKN5u 5rFmEYNltoE7T5V9jrvVnQ+JYMYTpkAcsF3fVXx4gwm6PeZAinx+WnJO/8no+kP5wo irazBvdBPLIsID9XskU1dpBDgbqrwzQ412eT/2i9EqE86RcSHkEYsmR0eDBmIMeLL9 PThlht1AoQ+jw== Message-ID: <5d3ccf9f-9e2c-4aa8-aaef-af83348fd344@kernel.org> Date: Fri, 9 Oct 2026 11:41:35 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] clk: xilinx: fix NULL pointer dereference in xvcu_clk_hw_unregister_leaf() To: Haotian Zhang , Stephen Boyd , Brian Masney , Jerome Brunet , Michal Simek , Michael Tretter Cc: linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <20261009061805.3172589-1-vulab@iscas.ac.cn> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 09/10/2026 08:18, Haotian Zhang wrote: > xvcu_clk_hw_unregister_leaf() gets the mux with > clk_hw_get_parent(divider), which returns NULL when the divider has no > parent, and passes it to clk_hw_unregister_mux() without checking it. > The following check tests the wrong variable: divider has already been > verified to be non-NULL at this point, so "if (!divider) return;" is > dead code and a NULL mux is dereferenced, crashing in > clk_hw_unregister_mux(). > > Only unregister the mux when it is non-NULL, and always release the > divider. So you fired up your OpenClaw or whatever LLM tool and don't bother to slow down, right? Best regards, Krzysztof