From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Laurent Pinchart , Michal Nazarewicz , Marek Szyprowski Subject: [PATCH 3.17 292/319] mm: cma: Dont crash on allocation if CMA area cant be activated Date: Wed, 12 Nov 2014 10:17:10 +0900 Message-Id: <20141112011041.156811215@linuxfoundation.org> In-Reply-To: <20141112010952.553519040@linuxfoundation.org> References: <20141112010952.553519040@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.17-stable review patch. If anyone has any objections, please let me know. ------------------ From: Laurent Pinchart commit f022d8cb7ec70fe8edd56383d876001317ee76b1 upstream. If activation of the CMA area fails its mutex won't be initialized, leading to an oops at allocation time when trying to lock the mutex. Fix this by setting the cma area count field to 0 when activation fails, leading to allocation returning NULL immediately. Signed-off-by: Laurent Pinchart Acked-by: Michal Nazarewicz Signed-off-by: Marek Szyprowski Signed-off-by: Greg Kroah-Hartman --- mm/cma.c | 1 + 1 file changed, 1 insertion(+) --- a/mm/cma.c +++ b/mm/cma.c @@ -123,6 +123,7 @@ static int __init cma_activate_area(stru err: kfree(cma->bitmap); + cma->count = 0; return -EINVAL; }