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

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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>

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Sasha Levin 2016-01-07 14:52:43 -05:00 • committed by David S. Miller

parent 18715b2615

commit 320f1a4a17

1 changed files with 1 additions and 1 deletions

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net/sctp/sysctl.c

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