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authorSven Eckelmann <sven@narfation.org>2012-08-20 23:37:26 +0200
committerAntonio Quartulli <ordex@autistici.org>2012-10-29 09:42:36 +0100
commitbd5b80d51a6c4a68f7d4b9b92c495329f47e53d4 (patch)
tree8650acb5b824f001651186e1357f4b7666437330
parent8e7c15d6b5468f0dcdd887db1e5df88e629c00d6 (diff)
batman-adv: Check return value of try_module_get
New operations should not be started when they need an increased module reference counter and try_module_get failed. This patch addresses Coverity #712284: Unchecked return value Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Antonio Quartulli <ordex@autistici.org>
-rw-r--r--net/batman-adv/debugfs.c6
-rw-r--r--net/batman-adv/icmp_socket.c12
-rw-r--r--net/batman-adv/main.c10
-rw-r--r--net/batman-adv/main.h2
4 files changed, 12 insertions, 18 deletions
diff --git a/net/batman-adv/debugfs.c b/net/batman-adv/debugfs.c
index 391d4fb2026f..bd032bc4e262 100644
--- a/net/batman-adv/debugfs.c
+++ b/net/batman-adv/debugfs.c
@@ -99,15 +99,17 @@ int batadv_debug_log(struct batadv_priv *bat_priv, const char *fmt, ...)
static int batadv_log_open(struct inode *inode, struct file *file)
{
+ if (!try_module_get(THIS_MODULE))
+ return -EBUSY;
+
nonseekable_open(inode, file);
file->private_data = inode->i_private;
- batadv_inc_module_count();
return 0;
}
static int batadv_log_release(struct inode *inode, struct file *file)
{
- batadv_dec_module_count();
+ module_put(THIS_MODULE);
return 0;
}
diff --git a/net/batman-adv/icmp_socket.c b/net/batman-adv/icmp_socket.c
index bde3cf747507..5874c0e84846 100644
--- a/net/batman-adv/icmp_socket.c
+++ b/net/batman-adv/icmp_socket.c
@@ -42,12 +42,16 @@ static int batadv_socket_open(struct inode *inode, struct file *file)
unsigned int i;
struct batadv_socket_client *socket_client;
+ if (!try_module_get(THIS_MODULE))
+ return -EBUSY;
+
nonseekable_open(inode, file);
socket_client = kmalloc(sizeof(*socket_client), GFP_KERNEL);
-
- if (!socket_client)
+ if (!socket_client) {
+ module_put(THIS_MODULE);
return -ENOMEM;
+ }
for (i = 0; i < ARRAY_SIZE(batadv_socket_client_hash); i++) {
if (!batadv_socket_client_hash[i]) {
@@ -59,6 +63,7 @@ static int batadv_socket_open(struct inode *inode, struct file *file)
if (i == ARRAY_SIZE(batadv_socket_client_hash)) {
pr_err("Error - can't add another packet client: maximum number of clients reached\n");
kfree(socket_client);
+ module_put(THIS_MODULE);
return -EXFULL;
}
@@ -71,7 +76,6 @@ static int batadv_socket_open(struct inode *inode, struct file *file)
file->private_data = socket_client;
- batadv_inc_module_count();
return 0;
}
@@ -96,7 +100,7 @@ static int batadv_socket_release(struct inode *inode, struct file *file)
spin_unlock_bh(&socket_client->lock);
kfree(socket_client);
- batadv_dec_module_count();
+ module_put(THIS_MODULE);
return 0;
}
diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c
index a4a337d9af9c..f9bcfa17f50f 100644
--- a/net/batman-adv/main.c
+++ b/net/batman-adv/main.c
@@ -160,16 +160,6 @@ void batadv_mesh_free(struct net_device *soft_iface)
atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
}
-void batadv_inc_module_count(void)
-{
- try_module_get(THIS_MODULE);
-}
-
-void batadv_dec_module_count(void)
-{
- module_put(THIS_MODULE);
-}
-
int batadv_is_my_mac(const uint8_t *addr)
{
const struct batadv_hard_iface *hard_iface;
diff --git a/net/batman-adv/main.h b/net/batman-adv/main.h
index 5c0be5b13415..9b94f05f8a17 100644
--- a/net/batman-adv/main.h
+++ b/net/batman-adv/main.h
@@ -150,8 +150,6 @@ extern struct workqueue_struct *batadv_event_workqueue;
int batadv_mesh_init(struct net_device *soft_iface);
void batadv_mesh_free(struct net_device *soft_iface);
-void batadv_inc_module_count(void);
-void batadv_dec_module_count(void);
int batadv_is_my_mac(const uint8_t *addr);
struct batadv_hard_iface *
batadv_seq_print_text_primary_if_get(struct seq_file *seq);