From: Greg KH <gregkh@linuxfoundation.org>
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 v2] staging: mmal-vchiq: add a check for the return of vmalloc()
Date: Tue, 15 Mar 2022 16:27:38 +0100 [thread overview]
Message-ID: <YjCwagaijyA2oO8r@kroah.com> (raw)
In-Reply-To: <tencent_7F2A8AAFF05125C6FF159033E69B5C108E07@qq.com>
On Tue, Mar 15, 2022 at 10:42:07PM +0800, xkernel.wang@foxmail.com wrote:
> From: Xiaoke Wang <xkernel.wang@foxmail.com>
>
> 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 <xkernel.wang@foxmail.com>
> ---
> ChangeLog:
> v1->v2 jump to the proper location and remove redundant instruction.
> drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c | 4 ++++
> 1 file changed, 4 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..ff4b484 100644
> --- a/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c
> +++ b/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c
> @@ -1909,6 +1909,10 @@ 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;
> + goto err_free;
> + }
> instance->vchiq_instance = vchiq_instance;
>
> mutex_init(&instance->context_map_lock);
> --
Your change just crashed the kernel :(
Please be more careful.
greg k-h
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2022-03-15 15:29 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-15 14:42 [PATCH v2] staging: mmal-vchiq: add a check for the return of vmalloc() xkernel.wang
2022-03-15 15:27 ` Greg KH [this message]
2022-03-15 15:53 ` Dan Carpenter
2022-03-15 16:23 ` Xiaoke Wang
2022-03-16 14:08 ` gregkh
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=YjCwagaijyA2oO8r@kroah.com \
--to=gregkh@linuxfoundation.org \
--cc=bcm-kernel-feedback-list@broadcom.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-rpi-kernel@lists.infradead.org \
--cc=linux-staging@lists.linux.dev \
--cc=nsaenz@kernel.org \
--cc=xkernel.wang@foxmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).