tree 01a4eb39de130787cdf321fe1c39896e47d1a1eb
parent 04d4fbca1017c11381e7d82acea21dd741e748bc
author Mathias Krause <minipli@googlemail.com> 1345030313 +0000
committer David S. Miller <davem@davemloft.net> 1345091791 -0700

llc: fix info leak via getsockname()

The LLC code wrongly returns 0, i.e. "success", when the socket is
zapped. Together with the uninitialized uaddrlen pointer argument from
sys_getsockname this leads to an arbitrary memory leak of up to 128
bytes kernel stack via the getsockname() syscall.

Return an error instead when the socket is zapped to prevent the info
leak. Also remove the unnecessary memset(0). We don't directly write to
the memory pointed by uaddr but memcpy() a local structure at the end of
the function that is properly initialized.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>