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can: bcm: fix warning in bcm_connect/proc_register

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Andrey Konovalov reported an issue with proc_register in bcm.c.
As suggested by Cong Wang this patch adds a lock_sock() protection and
a check for unsuccessful proc_create_data() in bcm_connect().

Reference: http://marc.info/?l=linux-netdev&m=147732648731237

Reported-by: Andrey Konovalov <andreyknvl@google.com>
Suggested-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Acked-by: Cong Wang <xiyou.wangcong@gmail.com>
Tested-by: Andrey Konovalov <andreyknvl@google.com>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Oliver Hartkopp 2016-10-24 21:11:26 +02:00 committed by Marc Kleine-Budde
parent 460d2830b0
commit deb507f91f
1 changed files with 23 additions and 9 deletions
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32
net/can/bcm.c
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@ -1549,24 +1549,31 @@ static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len,
struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
struct sock *sk = sock->sk;
struct bcm_sock *bo = bcm_sk(sk);
int ret = 0;
if (len < sizeof(*addr))
return -EINVAL;
if (bo->bound)
return -EISCONN;
lock_sock(sk);
if (bo->bound) {
ret = -EISCONN;
goto fail;
}
/* bind a device to this socket */
if (addr->can_ifindex) {
struct net_device *dev;
dev = dev_get_by_index(&init_net, addr->can_ifindex);
if (!dev)
return -ENODEV;
if (!dev) {
ret = -ENODEV;
goto fail;
}
if (dev->type != ARPHRD_CAN) {
dev_put(dev);
return -ENODEV;
ret = -ENODEV;
goto fail;
}
bo->ifindex = dev->ifindex;
@ -1577,17 +1584,24 @@ static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len,
bo->ifindex = 0;
}
bo->bound = 1;
if (proc_dir) {
/* unique socket address as filename */
sprintf(bo->procname, "%lu", sock_i_ino(sk));
bo->bcm_proc_read = proc_create_data(bo->procname, 0644,
proc_dir,
&bcm_proc_fops, sk);
if (!bo->bcm_proc_read) {
ret = -ENOMEM;
goto fail;
}
}
return 0;
bo->bound = 1;
fail:
release_sock(sk);
return ret;
}
static int bcm_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,