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    SubjectRe: [2.6.39-rc2, framebuffer] use after free oops
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    On 20 April 2011 17:56, Alan Cox <alan@lxorguk.ukuu.org.uk> wrote:
    > On Wed, 20 Apr 2011 08:05:35 +0200
    > Bruno Prémont <bonbons@linux-vserver.org> wrote:
    >
    >> On Wed, 20 Apr 2011 13:50:10 Daniel J Blueman <daniel.blueman@gmail.com> wrote:
    >> > Any ideas on how best to address this issue [0], since it causes
    >> > silent corruption, or at best crashes?
    >>
    >> There is probably no easy short-term fix to this...
    >
    > The short term fix would be to deliberately leak the buffer. That should
    > go into 2.6.39-rc right now with a comment explaining the situation.
    > Otherwise who knows what corruption may occur to user data if unlucky.
    >
    > The other 'cheat' might be to tweak the API so the removal API isn't a
    > 'destroy' interface but a 'shut down' and has a matching 'restart' one
    > for when the intelfb unloads at which point vga16fb can carry on with the
    > original fb_info 8)

    It looks like Andy Whitcroft addressed this issue some time ago, but
    forgot to send the fix upstream:

    http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-natty.git;a=patch;h=c5a742b5f78e161d6a13853a7e3e6e1dfa429e69;hp=26a1443f67eea17d4b78ef75df701782cc8bf35b

    Let's hope it can hit -rc7 since it's been in Ubuntu's kernel tree for
    considerable time, and fixes a silent corrupter:

    http://groups.google.com/group/linux.kernel/browse_thread/thread/fc9083f6f380ed5b/f801112b840785cb?show_docid=f801112b840785cb

    Thanks,
    Daniel
    --
    Daniel J Blueman
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