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 B3CFC23A0 for ; Tue, 15 Mar 2022 14:21:37 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5884EC340ED; Tue, 15 Mar 2022 14:21:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1647354097; bh=npWjB+bqC/Nu3wEdgF/Jo34oYz1o2X5lA+B8iC7SLiw=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=LKuSpamlCYrChmMa54G2EM5uPOi16qMzHDLb1+odUyAq6U9rkNFEDwhOM+pmhxhqM 1o5r2evCGn8RijzBOvK2TE2LWMiztrfJp4WXpyQgkge0URFpCM52zjSnHtgQThykQk 0OHEa0WP8Bytj8/snToyT/wT/ZfoTHi16W7cAX1w= Date: Tue, 15 Mar 2022 15:21:30 +0100 From: Greg KH To: xkernel.wang@foxmail.com Cc: nsaenz@kernel.org, bcm-kernel-feedback-list@broadcom.com, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH] staging: mmal-vchiq: add a check for the return of vmalloc() Message-ID: References: Precedence: bulk X-Mailing-List: linux-staging@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Fri, Mar 04, 2022 at 04:17:41PM +0800, xkernel.wang@foxmail.com wrote: > From: Xiaoke Wang > > vmalloc() is a memory allocation API which can return NULL when some > internal memory errors happen. So it is better to check the return > value of it to catch the error in time. > > Signed-off-by: Xiaoke Wang > --- > drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c b/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c > index 76d3f03..1bbd301 100644 > --- a/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c > +++ b/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c > @@ -1909,6 +1909,11 @@ int vchiq_mmal_init(struct vchiq_mmal_instance **out_instance) > mutex_init(&instance->vchiq_mutex); > > instance->bulk_scratch = vmalloc(PAGE_SIZE); > + if (!instance->bulk_scratch) { > + err = -ENOMEM; > + kfree(instance); This is called in the error section, please just jump to the proper location and then this line will not be needed. thanks, greg k-h