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batman-adv: Check return value of try_module_get

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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>
This commit is contained in:
Sven Eckelmann
2012-08-20 23:37:26 +02:00
committed by Antonio Quartulli
parent 8e7c15d6b5
commit bd5b80d51a
4 changed files with 12 additions and 18 deletions
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12
net/batman-adv/icmp_socket.c
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@@ -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;
}