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can: bcm: fix warning in bcm_connect/proc_register
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>
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@ -1549,24 +1549,31 @@ static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len,
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struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
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struct sock *sk = sock->sk;
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struct bcm_sock *bo = bcm_sk(sk);
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int ret = 0;
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if (len < sizeof(*addr))
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return -EINVAL;
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if (bo->bound)
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return -EISCONN;
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lock_sock(sk);
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if (bo->bound) {
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ret = -EISCONN;
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goto fail;
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}
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/* bind a device to this socket */
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if (addr->can_ifindex) {
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struct net_device *dev;
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dev = dev_get_by_index(&init_net, addr->can_ifindex);
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if (!dev)
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return -ENODEV;
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if (!dev) {
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ret = -ENODEV;
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goto fail;
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}
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if (dev->type != ARPHRD_CAN) {
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dev_put(dev);
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return -ENODEV;
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ret = -ENODEV;
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goto fail;
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}
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bo->ifindex = dev->ifindex;
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@ -1577,17 +1584,24 @@ static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len,
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bo->ifindex = 0;
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}
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bo->bound = 1;
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if (proc_dir) {
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/* unique socket address as filename */
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sprintf(bo->procname, "%lu", sock_i_ino(sk));
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bo->bcm_proc_read = proc_create_data(bo->procname, 0644,
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proc_dir,
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&bcm_proc_fops, sk);
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if (!bo->bcm_proc_read) {
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ret = -ENOMEM;
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goto fail;
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}
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}
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return 0;
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bo->bound = 1;
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fail:
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release_sock(sk);
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return ret;
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}
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static int bcm_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
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