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authorMichael Chan <mchan@broadcom.com>2014-03-17 19:19:06 -0800
committerDavid S. Miller <davem@davemloft.net>2014-03-18 16:02:16 -0400
commitf7bd12d09ed6e4093a56dbbfbe8411cc52a738d1 (patch)
tree9e7e3ee033404737317ef81b50c28391bc15bd6d
parentff0992e9036e9810e7cd45234fa32ca1e79750e2 (diff)
downloadlinux-linaro-stable-f7bd12d09ed6e4093a56dbbfbe8411cc52a738d1.tar.gz
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>
-rw-r--r--drivers/net/ethernet/broadcom/cnic.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/net/ethernet/broadcom/cnic.c b/drivers/net/ethernet/broadcom/cnic.c
index fcf9105a5476..2cb248269c8f 100644
--- a/drivers/net/ethernet/broadcom/cnic.c
+++ b/drivers/net/ethernet/broadcom/cnic.c
@@ -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