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authorMike Christie <michaelc@cs.wisc.edu>2006-02-02 06:07:01 +0300
committer <jejb@mulgrave.il.steeleye.com>2006-02-05 01:18:51 +0300
commitee7f8e405342722e42c15fe8e841a679f8951eea (patch)
tree3b21836a9bee874442817ac8f4433f552c6ccb26 /drivers/scsi/scsi_transport_iscsi.c
parent142e301fc818de9b116706835cd9fc864e73f203 (diff)
downloadlinux-ee7f8e405342722e42c15fe8e841a679f8951eea.tar.xz
[SCSI] iscsi update: set deamon pid earlier
>From michaelc@cs.wisc.edu: If the transport lookup fails we set the daemon pid too late. This can cause us deadlock since the netlink code will think we meant to call back into our iscsi_if_rx function. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: Alex Aizman <itn780@yahoo.com> Signed-off-by: Dmitry Yusupov <dmitry_yus@yahoo.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'drivers/scsi/scsi_transport_iscsi.c')
-rw-r--r--drivers/scsi/scsi_transport_iscsi.c16
1 files changed, 10 insertions, 6 deletions
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index 448fd78777f9..7fb69183c72d 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -846,9 +846,6 @@ iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
struct iscsi_cls_session *session;
struct iscsi_cls_conn *conn;
- if (NETLINK_CREDS(skb)->uid)
- return -EPERM;
-
priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
if (!priv)
return -EINVAL;
@@ -857,8 +854,6 @@ iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
if (!try_module_get(transport->owner))
return -EINVAL;
- daemon_pid = NETLINK_CREDS(skb)->pid;
-
switch (nlh->nlmsg_type) {
case ISCSI_UEVENT_CREATE_SESSION:
err = iscsi_if_create_session(priv, ev);
@@ -934,7 +929,7 @@ iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
/* Get message from skb (based on rtnetlink_rcv_skb). Each message is
* processed by iscsi_if_recv_msg. Malformed skbs with wrong length are
- * discarded silently. */
+ * or invalid creds discarded silently. */
static void
iscsi_if_rx(struct sock *sk, int len)
{
@@ -942,6 +937,12 @@ iscsi_if_rx(struct sock *sk, int len)
mutex_lock(&rx_queue_mutex);
while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
+ if (NETLINK_CREDS(skb)->uid) {
+ skb_pull(skb, skb->len);
+ goto free_skb;
+ }
+ daemon_pid = NETLINK_CREDS(skb)->pid;
+
while (skb->len >= NLMSG_SPACE(0)) {
int err;
uint32_t rlen;
@@ -953,10 +954,12 @@ iscsi_if_rx(struct sock *sk, int len)
skb->len < nlh->nlmsg_len) {
break;
}
+
ev = NLMSG_DATA(nlh);
rlen = NLMSG_ALIGN(nlh->nlmsg_len);
if (rlen > skb->len)
rlen = skb->len;
+
err = iscsi_if_recv_msg(skb, nlh);
if (err) {
ev->type = ISCSI_KEVENT_IF_ERROR;
@@ -980,6 +983,7 @@ iscsi_if_rx(struct sock *sk, int len)
} while (err < 0 && err != -ECONNREFUSED);
skb_pull(skb, rlen);
}
+free_skb:
kfree_skb(skb);
}
mutex_unlock(&rx_queue_mutex);