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sctp: make use of pre-calculated len 

Some sockopt handling functions were calculating the length of the
buffer to be written to userspace and then calculating it again when
actually writing the buffer, which could lead to some write not using
an up-to-date length.

This patch updates such places to just make use of the len variable.

Also, replace some sizeof(type) to sizeof(var).

Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
zero-colors
Marcelo Ricardo Leitner 2018-01-08 19:02:29 -02:00 committed by David S. Miller
parent 5960cefab9
commit c76f97c99a
1 changed files with 10 additions and 6 deletions
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16
net/sctp/socket.c
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@ -5025,7 +5025,7 @@ static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optv
len = sizeof(int);
if (put_user(len, optlen))
return -EFAULT;
if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int)))
if (copy_to_user(optval, &sctp_sk(sk)->autoclose, len))
return -EFAULT;
return 0;
}
@ -5655,6 +5655,9 @@ copy_getaddrs:
err = -EFAULT;
goto out;
}
/* XXX: We should have accounted for sizeof(struct sctp_getaddrs) too,
* but we can't change it anymore.
*/
if (put_user(bytes_copied, optlen))
err = -EFAULT;
out:
@ -6091,7 +6094,7 @@ static int sctp_getsockopt_maxseg(struct sock *sk, int len,
params.assoc_id = 0;
} else if (len >= sizeof(struct sctp_assoc_value)) {
len = sizeof(struct sctp_assoc_value);
if (copy_from_user(&params, optval, sizeof(params)))
if (copy_from_user(&params, optval, len))
return -EFAULT;
} else
return -EINVAL;
@ -6261,7 +6264,9 @@ static int sctp_getsockopt_active_key(struct sock *sk, int len,
if (len < sizeof(struct sctp_authkeyid))
return -EINVAL;
if (copy_from_user(&val, optval, sizeof(struct sctp_authkeyid)))
len = sizeof(struct sctp_authkeyid);
if (copy_from_user(&val, optval, len))
return -EFAULT;
asoc = sctp_id2assoc(sk, val.scact_assoc_id);
@ -6273,7 +6278,6 @@ static int sctp_getsockopt_active_key(struct sock *sk, int len,
else
val.scact_keynumber = ep->active_key_id;
len = sizeof(struct sctp_authkeyid);
if (put_user(len, optlen))
return -EFAULT;
if (copy_to_user(optval, &val, len))
@ -6299,7 +6303,7 @@ static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
if (len < sizeof(struct sctp_authchunks))
return -EINVAL;
if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
if (copy_from_user(&val, optval, sizeof(val)))
return -EFAULT;
to = p->gauth_chunks;
@ -6344,7 +6348,7 @@ static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
if (len < sizeof(struct sctp_authchunks))
return -EINVAL;
if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
if (copy_from_user(&val, optval, sizeof(val)))
return -EFAULT;
to = p->gauth_chunks;