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sctp: pass a kernel pointer to sctp_setsockopt_maxburst

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Use the kernel pointer that sctp_setsockopt has available instead of
directly handling the user pointer.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christoph Hellwig 2020-07-19 09:22:00 +02:00 committed by David S. Miller
parent 1031cea001
commit f5bee0adb1
1 changed files with 16 additions and 19 deletions
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35
net/sctp/socket.c
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@ -3482,12 +3482,13 @@ static int sctp_setsockopt_partial_delivery_point(struct sock *sk, u32 *val,
* future associations inheriting the socket value.
*/
static int sctp_setsockopt_maxburst(struct sock *sk,
char __user *optval,
struct sctp_assoc_value *params,
unsigned int optlen)
{
struct sctp_sock *sp = sctp_sk(sk);
struct sctp_assoc_value params;
struct sctp_association *asoc;
sctp_assoc_t assoc_id;
u32 assoc_value;
if (optlen == sizeof(int)) {
pr_warn_ratelimited(DEPRECATED
@ -3495,37 +3496,33 @@ static int sctp_setsockopt_maxburst(struct sock *sk,
"Use of int in max_burst socket option deprecated.\n"
"Use struct sctp_assoc_value instead\n",
current->comm, task_pid_nr(current));
if (copy_from_user(&params.assoc_value, optval, optlen))
return -EFAULT;
params.assoc_id = SCTP_FUTURE_ASSOC;
assoc_id = SCTP_FUTURE_ASSOC;
assoc_value = *((int *)params);
} else if (optlen == sizeof(struct sctp_assoc_value)) {
if (copy_from_user(&params, optval, optlen))
return -EFAULT;
assoc_id = params->assoc_id;
assoc_value = params->assoc_value;
} else
return -EINVAL;
asoc = sctp_id2assoc(sk, params.assoc_id);
if (!asoc && params.assoc_id > SCTP_ALL_ASSOC &&
sctp_style(sk, UDP))
asoc = sctp_id2assoc(sk, assoc_id);
if (!asoc && assoc_id > SCTP_ALL_ASSOC && sctp_style(sk, UDP))
return -EINVAL;
if (asoc) {
asoc->max_burst = params.assoc_value;
asoc->max_burst = assoc_value;
return 0;
}
if (sctp_style(sk, TCP))
params.assoc_id = SCTP_FUTURE_ASSOC;
assoc_id = SCTP_FUTURE_ASSOC;
if (params.assoc_id == SCTP_FUTURE_ASSOC ||
params.assoc_id == SCTP_ALL_ASSOC)
sp->max_burst = params.assoc_value;
if (assoc_id == SCTP_FUTURE_ASSOC || assoc_id == SCTP_ALL_ASSOC)
sp->max_burst = assoc_value;
if (params.assoc_id == SCTP_CURRENT_ASSOC ||
params.assoc_id == SCTP_ALL_ASSOC)
if (assoc_id == SCTP_CURRENT_ASSOC || assoc_id == SCTP_ALL_ASSOC)
list_for_each_entry(asoc, &sp->ep->asocs, asocs)
asoc->max_burst = params.assoc_value;
asoc->max_burst = assoc_value;
return 0;
}
@ -4699,7 +4696,7 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname,
retval = sctp_setsockopt_fragment_interleave(sk, kopt, optlen);
break;
case SCTP_MAX_BURST:
retval = sctp_setsockopt_maxburst(sk, optval, optlen);
retval = sctp_setsockopt_maxburst(sk, kopt, optlen);
break;
case SCTP_AUTH_CHUNK:
retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);