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sctp: pass a kernel pointer to sctp_setsockopt_reset_streams 

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 09:22:16 +02:00 committed by David S. Miller
parent 356dc6f16a
commit d492243435
1 changed files with 5 additions and 15 deletions
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20
net/sctp/socket.c
View File

@ -4061,12 +4061,10 @@ out:
}
static int sctp_setsockopt_reset_streams(struct sock *sk,
char __user *optval,
struct sctp_reset_streams *params,
unsigned int optlen)
{
struct sctp_reset_streams *params;
struct sctp_association *asoc;
int retval = -EINVAL;
if (optlen < sizeof(*params))
return -EINVAL;
@ -4074,23 +4072,15 @@ static int sctp_setsockopt_reset_streams(struct sock *sk,
optlen = min_t(unsigned int, optlen, USHRT_MAX +
sizeof(__u16) * sizeof(*params));
params = memdup_user(optval, optlen);
if (IS_ERR(params))
return PTR_ERR(params);
if (params->srs_number_streams * sizeof(__u16) >
optlen - sizeof(*params))
goto out;
return -EINVAL;
asoc = sctp_id2assoc(sk, params->srs_assoc_id);
if (!asoc)
goto out;
return -EINVAL;
retval = sctp_send_reset_streams(asoc, params);
out:
kfree(params);
return retval;
return sctp_send_reset_streams(asoc, params);
}
static int sctp_setsockopt_reset_assoc(struct sock *sk,
@ -4682,7 +4672,7 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname,
retval = sctp_setsockopt_enable_strreset(sk, kopt, optlen);
break;
case SCTP_RESET_STREAMS:
retval = sctp_setsockopt_reset_streams(sk, optval, optlen);
retval = sctp_setsockopt_reset_streams(sk, kopt, optlen);
break;
case SCTP_RESET_ASSOC:
retval = sctp_setsockopt_reset_assoc(sk, optval, optlen);