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cnic: Use proper ulp_ops for per device operations. 

For per device operations, cnic needs to dereference the RCU protected
cp->ulp_ops instead of the global cnic_ulp_tbl.  In 2 locations,
cnic_send_nlmsg() and cnic_copy_ulp_stats(), it was referencing the
global table.  If the device has been unregistered and these functions
are still being called (very unlikely scenarios), it could lead to NULL
pointer dereference.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael Chan 2014-03-17 19:19:06 -08:00 committed by David S. Miller
parent ff0992e903
commit f7bd12d09e
1 changed files with 3 additions and 2 deletions
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5
drivers/net/ethernet/broadcom/cnic.c
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@ -342,7 +342,7 @@ static int cnic_send_nlmsg(struct cnic_local *cp, u32 type,
while (retry < 3) {
rc = 0;
rcu_read_lock();
ulp_ops = rcu_dereference(cnic_ulp_tbl[CNIC_ULP_ISCSI]);
ulp_ops = rcu_dereference(cp->ulp_ops[CNIC_ULP_ISCSI]);
if (ulp_ops)
rc = ulp_ops->iscsi_nl_send_msg(
cp->ulp_handle[CNIC_ULP_ISCSI],
@ -3244,7 +3244,8 @@ static int cnic_copy_ulp_stats(struct cnic_dev *dev, int ulp_type)
int rc;
mutex_lock(&cnic_lock);
ulp_ops = cnic_ulp_tbl_prot(ulp_type);
ulp_ops = rcu_dereference_protected(cp->ulp_ops[ulp_type],
lockdep_is_held(&cnic_lock));
if (ulp_ops && ulp_ops->cnic_get_stats)
rc = ulp_ops->cnic_get_stats(cp->ulp_handle[ulp_type]);
else