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 EBFA4353A8E; Tue, 11 Aug 2026 18:51:35 +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=1786474297; cv=none; b=m2Oc6BSwWNb23d+/0iyOEc42E+3eD34zdlTzNXkyFoFVF1V6UeYH/bxF/ZY/Cm8a9A3ZutV8M2AhQf6rpZXzMgCtRyVJR3pUYiJuRTihofKp0zm/YcVZaftC5ObBfW+nTY3/DbzcUrUL2o/OxdRttKuRX67aHtKbnQbFYZC1zwg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786474297; c=relaxed/simple; bh=9RVGymyr63M+CuIUGj+cqQdmJUybT4RexizDE3U83ns=; h=From:To:Cc:In-Reply-To:References:Subject:Message-Id:Date: MIME-Version:Content-Type; b=gWBgWfXx8Yp9/MP+jfbUszSpbD3bHG7G9nbFuyOUsrZzj6tfEZAhPzFMJeQuFCJLLcen/i1SSzgnBeVc22cv7hv/vwLo2UVwNQHi2j+5wB30ww9qLhPWV70arClPNOPr9SC3fE2RoV3DaLcg+JjclOmKRpGNDpyYqbI4k57ZqxQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=IPJYYvfb; 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="IPJYYvfb" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9794A1F00A3A; Tue, 11 Aug 2026 18:51:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1786474295; bh=78jkVzzHUSr8oR3vzkTgpDE+8qGTzuuPqvrfa8j7gEw=; h=From:To:Cc:In-Reply-To:References:Subject:Date; b=IPJYYvfbWgWUHpLf32oI6yw9nfrp9qHC/z1S01FH6YPvTpik3iXjCRhlg/kJ3VlTR IMFtK+II2vWxawUWjtdjEJnAfZyFf/uc7xyPgHWhofsKw03CjLbMmdVsYkhKPkGNtU ZdwE0O8REintcvzJekrVVq4fLCTnzTYJTarg8p5Eg4RVp1tISZyvDdxuX4EqdVhdgJ B9/EA/AiLSDgpWkiBQRQB8gVEjaHdv2LjB7Nhod2XvlwStAsOG6uC8DS+kioe1PUup Yn7zPcmLCItJjISOAForAhCuJ2SoE0i+TDy/hTqxmK/i+CB0i3B4bV6SFQ19eGlttz KQbWBxjQCONWA== From: Vinod Koul To: Frank Li , Martin Kaiser Cc: Steven Rostedt , Masami Hiramatsu , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, imx@lists.linux.dev, dmaengine@vger.kernel.org, stable@vger.kernel.org In-Reply-To: <20260718130024.341243-1-martin@kaiser.cx> References: <20260718130024.341243-1-martin@kaiser.cx> Subject: Re: [PATCH v2] dmaengine: fsl-edma: tracing: no ptr dereference during log output Message-Id: <178647429224.1113716.1062810521058645946.b4-ty@kernel.org> Date: Wed, 12 Aug 2026 00:21:32 +0530 Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Mailer: b4 0.13.0 On Sat, 18 Jul 2026 14:58:48 +0200, Martin Kaiser wrote: > The fsl edma events store a pointer to a struct fsl_edma_engine in the > ringbuffer and dereference it when a log entry is printed. At this time, > the pointer may no longer be valid. > > Event injection can be used to trigger a crash: > > $ cd /sys/kernel/tracing > $ echo 'value = 0' > events/fsl_edma/edma_writeb/inject > $ cat trace > > [...] Applied, thanks! [1/1] dmaengine: fsl-edma: tracing: no ptr dereference during log output commit: 2ea04dca8e627f722caa7a2037cfbae0257f3501 Best regards, -- ~Vinod