refcount_t type and corresponding API should be
used instead of atomic_t when the variable is used as
a reference counter. This allows to avoid accidental
refcounter overflows that might lead to use-after-free
situations.
Signed-off-by: Elena Reshetova <elena.reshetova@xxxxxxxxx>
Signed-off-by: Hans Liljestrand <ishkamiel@xxxxxxxxx>
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Signed-off-by: David Windsor <dwindsor@xxxxxxxxx>
---
drivers/net/ethernet/mellanox/mlx5/core/fs_core.c | 24 +++++++++++------------
drivers/net/ethernet/mellanox/mlx5/core/fs_core.h | 3 ++-
2 files changed, 14 insertions(+), 13 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c b/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
index 2478516..4f74d15 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
@@ -163,7 +163,7 @@ static void tree_init_node(struct fs_node *node,
unsigned int refcount,
void (*remove_func)(struct fs_node *))
{
- atomic_set(&node->refcount, refcount);
+ refcount_set(&node->refcount, refcount);
INIT_LIST_HEAD(&node->list);
INIT_LIST_HEAD(&node->children);
mutex_init(&node->lock);
@@ -173,7 +173,7 @@ static void tree_init_node(struct fs_node *node,
static void tree_add_node(struct fs_node *node, struct fs_node *parent)
{
if (parent)
- atomic_inc(&parent->refcount);
+ refcount_inc(&parent->refcount);
node->parent = parent;
/* Parent is the root */
@@ -185,7 +185,7 @@ static void tree_add_node(struct fs_node *node, struct fs_node *parent)
static void tree_get_node(struct fs_node *node)
{
- atomic_inc(&node->refcount);
+ refcount_inc(&node->refcount);
}
static void nested_lock_ref_node(struct fs_node *node,
@@ -193,7 +193,7 @@ static void nested_lock_ref_node(struct fs_node *node,
{
if (node) {
mutex_lock_nested(&node->lock, class);
- atomic_inc(&node->refcount);
+ refcount_inc(&node->refcount);
}
}
@@ -201,14 +201,14 @@ static void lock_ref_node(struct fs_node *node)
{
if (node) {
mutex_lock(&node->lock);
- atomic_inc(&node->refcount);
+ refcount_inc(&node->refcount);
}
}
static void unlock_ref_node(struct fs_node *node)
{
if (node) {
- atomic_dec(&node->refcount);
+ refcount_dec(&node->refcount);
mutex_unlock(&node->lock);
}
}
@@ -218,7 +218,7 @@ static void tree_put_node(struct fs_node *node)
struct fs_node *parent_node = node->parent;
lock_ref_node(parent_node);
- if (atomic_dec_and_test(&node->refcount)) {
+ if (refcount_dec_and_test(&node->refcount)) {
if (parent_node)
list_del_init(&node->list);
if (node->remove_func)
@@ -233,8 +233,8 @@ static void tree_put_node(struct fs_node *node)
static int tree_remove_node(struct fs_node *node)
{
- if (atomic_read(&node->refcount) > 1) {
- atomic_dec(&node->refcount);
+ if (refcount_read(&node->refcount) > 1) {
+ refcount_dec(&node->refcount);
return -EEXIST;
}
tree_put_node(node);
@@ -982,7 +982,7 @@ static void destroy_flow_handle(struct fs_fte *fte,
int i)
{
for (; --i >= 0;) {
- if (atomic_dec_and_test(&handle->rule[i]->node.refcount)) {
+ if (refcount_dec_and_test(&handle->rule[i]->node.refcount)) {
fte->dests_size--;
list_del(&handle->rule[i]->node.list);
kfree(handle->rule[i]);
@@ -1013,7 +1013,7 @@ create_flow_handle(struct fs_fte *fte,
if (dest) {
rule = find_flow_rule(fte, dest + i);
if (rule) {
- atomic_inc(&rule->node.refcount);
+ refcount_inc(&rule->node.refcount);
goto rule_found;
}
}
@@ -1282,7 +1282,7 @@ static struct mlx5_flow_handle *add_rule_fg(struct mlx5_flow_group *fg,
list_add(&fte->node.list, prev);
add_rules:
for (i = 0; i < handle->num_rules; i++) {
- if (atomic_read(&handle->rule[i]->node.refcount) == 1)
+ if (refcount_read(&handle->rule[i]->node.refcount) == 1)
tree_add_node(&handle->rule[i]->node, &fte->node);
}
unlock_fte:
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fs_core.h b/drivers/net/ethernet/mellanox/mlx5/core/fs_core.h
index 8e668c6..86bc743b 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/fs_core.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/fs_core.h
@@ -33,6 +33,7 @@
#ifndef _MLX5_FS_CORE_
#define _MLX5_FS_CORE_
+#include <linux/refcount.h>
#include <linux/mlx5/fs.h>
enum fs_node_type {
@@ -80,7 +81,7 @@ struct fs_node {
struct fs_node *root;
/* lock the node for writing and traversing */
struct mutex lock;
- atomic_t refcount;
+ refcount_t refcount;
void (*remove_func)(struct fs_node *);
};
--
2.7.4
--
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