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From: Greg KH <gregkh@linuxfoundation.org>
To: Kyungtae Kim <kt0755@gmail.com>
Cc: balbi@kernel.org, syzkaller <syzkaller@googlegroups.com>,
	USB list <linux-usb@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Dave Tian <dave.jing.tian@gmail.com>
Subject: Re: KASAN: slab-out-of-bounds Read in gadget_dev_desc_UDC_store
Date: Fri, 1 May 2020 09:05:38 +0200	[thread overview]
Message-ID: <20200501070538.GB887524@kroah.com> (raw)
In-Reply-To: <CAEAjamvq+puThrxfo80TOy=xgbQEQNT6xvxy4w6hP2O1By66uw@mail.gmail.com>

On Thu, Apr 30, 2020 at 11:03:54PM -0400, Kyungtae Kim wrote:
> We report a bug (in linux-5.6.8) found by FuzzUSB (a modified version
> of syzkaller).
> 
> This happened when the size of "name" buffer is smaller than that of
> "page" buffer
> (after function kstrdup executed at line 263).
> I guess it comes from the "page" buffer containing 0 value in the middle.
> So accessing the "name" buffer with "len" variable, which is used to
> indicate the size of "page" buffer,
> triggered memory access violation.
> To fix, it may need to check the size of name buffer, and try to use
> right index variable.

Can you submit a patch for this as you have a reproducer to test the
issue?

thanks,

greg k-h

  reply	other threads:[~2020-05-01  7:05 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-01  3:03 Kyungtae Kim
2020-05-01  7:05 ` Greg KH [this message]
2020-05-06  4:08   ` Kyungtae Kim

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