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iscsi-target: Fix ERL=2 ASYNC_EVENT connection pointer bug 

This patch fixes a long-standing bug in iscsit_build_conn_drop_async_message()
where during ERL=2 connection recovery, a bogus conn_p pointer could
end up being used to send the ISCSI_OP_ASYNC_EVENT + DROPPING_CONNECTION
notifying the initiator that cmd->logout_cid has failed.

The bug was manifesting itself as an OOPs in iscsit_allocate_cmd() with
a bogus conn_p pointer in iscsit_build_conn_drop_async_message().

Reported-by: Arshad Hussain <arshad.hussain@calsoftinc.com>
Reported-by: santosh kulkarni <santosh.kulkarni@calsoftinc.com>
Cc: <stable@vger.kernel.org> #3.1+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2014-02-19 23:32:14 +00:00
parent f225225848
commit d444edc679
1 changed files with 3 additions and 1 deletions
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4
drivers/target/iscsi/iscsi_target.c
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@ -2491,6 +2491,7 @@ static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
{
struct iscsi_cmd *cmd;
struct iscsi_conn *conn_p;
bool found = false;
/*
* Only send a Asynchronous Message on connections whos network
@ -2499,11 +2500,12 @@ static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
iscsit_inc_conn_usage_count(conn_p);
found = true;
break;
}
}
if (!conn_p)
if (!found)
return;
cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);