tree 3028662cc73e52e7c7d5c025f3207dbb9f3fc25a
parent 18715b261541f35ccede9b8686ee3ebaac697d38
author Sasha Levin <sasha.levin@oracle.com> 1452196363 -0500
committer David S. Miller <davem@davemloft.net> 1452466861 -0500

net: sctp: prevent writes to cookie_hmac_alg from accessing invalid memory

proc_dostring() needs an initialized destination string, while the one
provided in proc_sctp_do_hmac_alg() contains stack garbage.

Thus, writing to cookie_hmac_alg would strlen() that garbage and end up
accessing invalid memory.

Fixes: 3c68198e7 ("sctp: Make hmac algorithm selection for cookie generation dynamic")
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>