[Xen-changelog] [qemu-xen-traditional stable-4.1] pcnet: force the buffer access to be in bounds during tx

[patchbot@xxxxxxx]

*** New tip has no discernable common ancestor with previous history ***

commit 77d9bdb27c4237a007ba93a6f159791eed317abc
Author:     Petr Matousek <pmatouse@xxxxxxxxxx>
AuthorDate: Sun May 24 10:53:44 2015 +0200
Commit:     Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
CommitDate: Tue Jun 23 11:44:30 2015 +0100

    pcnet: force the buffer access to be in bounds during tx
    
    4096 is the maximum length per TMD and it is also currently the size of
    the relay buffer pcnet driver uses for sending the packet data to QEMU
    for further processing. With packet spanning multiple TMDs it can
    happen that the overall packet size will be bigger than sizeof(buffer),
    which results in memory corruption.
    
    Fix this by only allowing to queue maximum sizeof(buffer) bytes.
    
    This is CVE-2015-3209.
    
    Signed-off-by: Petr Matousek <pmatouse@xxxxxxxxxx>
    Reported-by: Matt Tait <matttait@xxxxxxxxxx>
    Reviewed-by: Peter Maydell <peter.maydell@xxxxxxxxxx>
    Reviewed-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
--
generated by git-patchbot for /home/xen/git/qemu-xen-traditional.git#stable-4.1

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