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From: Greg Kroah-Hartman <gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>
To: Chunfeng Yun <chunfeng.yun-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
Cc: linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-mediatek-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
Subject: Re: [PATCH] usb: core: buffer: avoid NULL pointer dereferrence
Date: Fri, 8 Apr 2016 07:07:01 -0700	[thread overview]
Message-ID: <20160408140701.GA3547@kroah.com> (raw)
In-Reply-To: <1460106483-24793-1-git-send-email-chunfeng.yun-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>

On Fri, Apr 08, 2016 at 05:08:03PM +0800, Chunfeng Yun wrote:
> NULL pointer dereferrence will happen when class driver
> wants to allocate zero length buffer and pool_max[0]
> can't be used, so skip reserved pool in this case.

Why would a driver want to allocate a 0 length buffer?  What driver does
this?

Shouldn't we fix that issue instead?

thanks,

greg k-h

WARNING: multiple messages have this Message-ID (diff)
From: gregkh@linuxfoundation.org (Greg Kroah-Hartman)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] usb: core: buffer: avoid NULL pointer dereferrence
Date: Fri, 8 Apr 2016 07:07:01 -0700	[thread overview]
Message-ID: <20160408140701.GA3547@kroah.com> (raw)
In-Reply-To: <1460106483-24793-1-git-send-email-chunfeng.yun@mediatek.com>

On Fri, Apr 08, 2016 at 05:08:03PM +0800, Chunfeng Yun wrote:
> NULL pointer dereferrence will happen when class driver
> wants to allocate zero length buffer and pool_max[0]
> can't be used, so skip reserved pool in this case.

Why would a driver want to allocate a 0 length buffer?  What driver does
this?

Shouldn't we fix that issue instead?

thanks,

greg k-h

WARNING: multiple messages have this Message-ID (diff)
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Chunfeng Yun <chunfeng.yun@mediatek.com>
Cc: linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, linux-usb@vger.kernel.org,
	linux-mediatek@lists.infradead.org
Subject: Re: [PATCH] usb: core: buffer: avoid NULL pointer dereferrence
Date: Fri, 8 Apr 2016 07:07:01 -0700	[thread overview]
Message-ID: <20160408140701.GA3547@kroah.com> (raw)
In-Reply-To: <1460106483-24793-1-git-send-email-chunfeng.yun@mediatek.com>

On Fri, Apr 08, 2016 at 05:08:03PM +0800, Chunfeng Yun wrote:
> NULL pointer dereferrence will happen when class driver
> wants to allocate zero length buffer and pool_max[0]
> can't be used, so skip reserved pool in this case.

Why would a driver want to allocate a 0 length buffer?  What driver does
this?

Shouldn't we fix that issue instead?

thanks,

greg k-h

  parent reply	other threads:[~2016-04-08 14:07 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-04-08  9:08 [PATCH] usb: core: buffer: avoid NULL pointer dereferrence Chunfeng Yun
2016-04-08  9:08 ` Chunfeng Yun
2016-04-08  9:08 ` Chunfeng Yun
     [not found] ` <1460106483-24793-1-git-send-email-chunfeng.yun-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
2016-04-08 14:07   ` Greg Kroah-Hartman [this message]
2016-04-08 14:07     ` Greg Kroah-Hartman
2016-04-08 14:07     ` Greg Kroah-Hartman
     [not found]     ` <20160408140701.GA3547-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org>
2016-04-08 15:21       ` Alan Stern
2016-04-08 15:21         ` Alan Stern
2016-04-08 15:21         ` Alan Stern
2016-04-26 23:11         ` Greg Kroah-Hartman
2016-04-26 23:11           ` Greg Kroah-Hartman
     [not found]           ` <20160426231115.GB23273-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org>
2016-04-27  1:32             ` chunfeng yun
2016-04-27  1:32               ` chunfeng yun
2016-04-27  1:32               ` chunfeng yun
2016-04-11  3:01     ` chunfeng yun
2016-04-11  3:01       ` chunfeng yun
2016-04-11  3:01       ` chunfeng yun
2016-04-11  5:07       ` Felipe Balbi
2016-04-11  5:07         ` Felipe Balbi
2016-04-11  5:07         ` Felipe Balbi
2016-04-11  7:16         ` chunfeng yun
2016-04-11  7:16           ` chunfeng yun
2016-04-11  7:16           ` chunfeng yun
2016-04-11  8:24           ` Felipe Balbi
2016-04-11  8:24             ` Felipe Balbi
2016-04-11  8:24             ` Felipe Balbi
2016-04-11 14:44           ` Alan Stern
2016-04-11 14:44             ` Alan Stern

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