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net: add checks to validate ring buffer pointers(CVE-2015-5279)
Ne2000 NIC uses ring buffer of NE2000_MEM_SIZE(49152) bytes to process network packets. While receiving packets via ne2000_receive() routine, a local 'index' variable could exceed the ring buffer size, which could lead to a memory buffer overflow. Added other checks at initialisation. Reported-by: Qinghao Tang <luodalongde@gmail.com> Signed-off-by: P J P <pjp@fedoraproject.org> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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