tree 0bc2ce5536a6c72a668319559099b2b3fad1debe
parent 1c95df85ca49640576de2f0a850925957b547b84
author Neal Cardwell <ncardwell@google.com> 1354995802 +0000
committer David S. Miller <davem@davemloft.net> 1355097577 -0500

inet_diag: validate byte code to prevent oops in inet_diag_bc_run()

Add logic to validate INET_DIAG_BC_S_COND and INET_DIAG_BC_D_COND
operations.

Previously we did not validate the inet_diag_hostcond, address family,
address length, and prefix length. So a malicious user could make the
kernel read beyond the end of the bytecode array by claiming to have a
whole inet_diag_hostcond when the bytecode was not long enough to
contain a whole inet_diag_hostcond of the given address family. Or
they could make the kernel read up to about 27 bytes beyond the end of
a connection address by passing a prefix length that exceeded the
length of addresses of the given family.

Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>