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sctp: correct bounds check in sctp_setsockopt_auth_key 

The bonds check to prevent buffer overlflow was not exactly
right.  It still allowed overflow of up to 8 bytes which is
sizeof(struct sctp_authkey).

Since optlen is already checked against the size of that struct,
we are guaranteed not to cause interger overflow either.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vlad Yasevich 2008-08-27 16:08:54 -07:00 committed by David S. Miller
parent f2455eb176
commit 328fc47ea0
1 changed files with 1 additions and 1 deletions
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2
net/sctp/socket.c
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@ -3144,7 +3144,7 @@ static int sctp_setsockopt_auth_key(struct sock *sk,
goto out;
}
if (authkey->sca_keylength > optlen) {
if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
ret = -EINVAL;
goto out;
}