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| author | Christoph Hellwig <hch@lst.de> | 2020-07-19 09:22:00 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-07-19 18:26:42 -0700 |
| commit | f5bee0adb17eaa2f106c895d198b1e8fca96f1de (patch) | |
| tree | ad22e12aaf0f7a6463d5e629a938d4c4e512b07d /net/sctp/socket.c | |
| parent | 1031cea0019ec967a260ad835c0a5fe03d1b93a5 (diff) | |
| download | lwn-f5bee0adb17eaa2f106c895d198b1e8fca96f1de.tar.gz lwn-f5bee0adb17eaa2f106c895d198b1e8fca96f1de.zip | |
sctp: pass a kernel pointer to sctp_setsockopt_maxburst
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>
Diffstat (limited to 'net/sctp/socket.c')
| -rw-r--r-- | net/sctp/socket.c | 35 |
1 files changed, 16 insertions, 19 deletions
diff --git a/net/sctp/socket.c b/net/sctp/socket.c index 874cec731530..ac7dff849290 100644 --- a/net/sctp/socket.c +++ b/net/sctp/socket.c @@ -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(¶ms.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(¶ms, 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); |