From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 C7E5E44C97; Sun, 1 Sep 2024 16:21:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725207704; cv=none; b=DJp3Sw1hs4Bm3rirUCDft4yV9RtBxScF/GlW7bnOXfQnHJwve322XSQsWckgGxx2Nxy/9qrJ7LyYK/mOjLjwSI+8vM2h818hf/GSQzJta+NPKVLiT8HsEjz4Rf/KKvLLPMBufa1US8p1WRA5xxBhUkXi+mNjNZlQDpN4zETvI3c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725207704; c=relaxed/simple; bh=jrL/fZ+RD4vOMmnxX1VGyeuonQRqpmd1JvkV10lP1K8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=h9cxYFbUlJgdM73cp04BXPDN3DeRKJ/B0fx4KdRy91FTUiZ9MHScZZkOuimm3V/77Tm+UwvwnQjutMpm56ya8FET9z+bRp2raqQKGUIDFy8ImycxZo57RHS7sAwBp0xgHHZKPlOERiWRxe/b6IH1xn74Ucj9bI6dfLMWDVY7s0w= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=cSrsHQbu; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="cSrsHQbu" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3A515C4CEC3; Sun, 1 Sep 2024 16:21:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1725207704; bh=jrL/fZ+RD4vOMmnxX1VGyeuonQRqpmd1JvkV10lP1K8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cSrsHQbuCsIpcaIQqbXZQJd5IHIUOeeWjxUTyNeXIzVcbtPwlfZVQU3cHnFvT/+1z Ci7LwqgHejoivgIzbRpOJ4kLl39YoTzbBc0dCnHjynNEKwGEuJaXCqaoZHg09Xxgii 7WlesHNzsL5En74hbaQtJjcouSbzXwHdiC8sKhBs= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Phil Chang , Anna-Maria Behnsen , Thomas Gleixner , Sasha Levin Subject: [PATCH 4.19 51/98] hrtimer: Prevent queuing of hrtimer without a function callback Date: Sun, 1 Sep 2024 18:16:21 +0200 Message-ID: <20240901160805.624963222@linuxfoundation.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240901160803.673617007@linuxfoundation.org> References: <20240901160803.673617007@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Phil Chang [ Upstream commit 5a830bbce3af16833fe0092dec47b6dd30279825 ] The hrtimer function callback must not be NULL. It has to be specified by the call side but it is not validated by the hrtimer code. When a hrtimer is queued without a function callback, the kernel crashes with a null pointer dereference when trying to execute the callback in __run_hrtimer(). Introduce a validation before queuing the hrtimer in hrtimer_start_range_ns(). [anna-maria: Rephrase commit message] Signed-off-by: Phil Chang Signed-off-by: Anna-Maria Behnsen Signed-off-by: Thomas Gleixner Reviewed-by: Anna-Maria Behnsen Signed-off-by: Sasha Levin --- kernel/time/hrtimer.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c index 0eb5b6cc6d939..b600dc1290d7e 100644 --- a/kernel/time/hrtimer.c +++ b/kernel/time/hrtimer.c @@ -1172,6 +1172,8 @@ void hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim, struct hrtimer_clock_base *base; unsigned long flags; + if (WARN_ON_ONCE(!timer->function)) + return; /* * Check whether the HRTIMER_MODE_SOFT bit and hrtimer.is_soft * match. -- 2.43.0