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SUNRPC: Fix error handling in svc_setup_socket()

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Dan points out that sock_alloc_file() releases @sock on error, but
so do all of svc_setup_socket's callers, resulting in a double-
release if sock_alloc_file() returns an error.

Rather than allocating a struct file for all new sockets, allocate
one only for sockets created during a TCP accept. For the moment,
those are the only ones that will ever be used with RPC-with-TLS.

Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Fixes: ae0d77708a ("SUNRPC: Ensure server-side sockets have a sock->file")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2023-05-04 13:43:33 -04:00
parent 29cd2927fb
commit 319050d430
1 changed files with 4 additions and 12 deletions
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16
net/sunrpc/svcsock.c
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@ -895,6 +895,9 @@ static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt)
trace_svcsock_accept_err(xprt, serv->sv_name, err);
return NULL;
}
if (IS_ERR(sock_alloc_file(newsock, O_NONBLOCK, NULL)))
return NULL;
set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
err = kernel_getpeername(newsock, sin);
@ -935,7 +938,7 @@ static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt)
return &newsvsk->sk_xprt;
failed:
sock_release(newsock);
sockfd_put(newsock);
return NULL;
}
@ -1430,7 +1433,6 @@ static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
struct socket *sock,
int flags)
{
struct file *filp = NULL;
struct svc_sock *svsk;
struct sock *inet;
int pmap_register = !(flags & SVC_SOCK_ANONYMOUS);
@ -1439,14 +1441,6 @@ static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
if (!svsk)
return ERR_PTR(-ENOMEM);
if (!sock->file) {
filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
if (IS_ERR(filp)) {
kfree(svsk);
return ERR_CAST(filp);
}
}
inet = sock->sk;
if (pmap_register) {
@ -1456,8 +1450,6 @@ static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
inet->sk_protocol,
ntohs(inet_sk(inet)->inet_sport));
if (err < 0) {
if (filp)
fput(filp);
kfree(svsk);
return ERR_PTR(err);
}