Hi Folks
I asked Julai Lawall to run her Coccinelle
(http://coccinelle.lip6.fr/) test suite on batman-adv. Here are her
results. Some of these issues are already fixed in subversion, others
are real bugs, and some are nice to fix.
Andrew
----- Forwarded message from Julia Lawall <[email protected]> -----
Date: Thu, 31 Dec 2009 17:40:21 +0100 (CET)
From: Julia Lawall <[email protected]>
To: Andrew Lunn <[email protected]>
Subject: Re: Standard coccinelle tests?
X-Spam-Status: No, score=-2.6 required=4.0 tests=BAYES_00 autolearn=ham
version=3.2.5
I ran all of my tests on your code, and came up with the following
results. Search for *** to see my comments about what I think should be
done. It is only the first one that seems like a serious bug. Actually,
I worked on that problem quite recently, but it must have been just before
your code showed up, or I missed it for some other reason, because I don't
have a record of having submitted a patch for that issue for your code.
julia
dev_addr.cocci
***dev->dev_addr is a pointer. The size of an address is probably 6. dev
has an addr_len field that might be initialized.
diff -u -p /var/linuxes/linux-next/drivers/staging/batman-adv/soft-interface.c
/tmp/nothing
--- /var/linuxes/linux-next/drivers/staging/batman-adv/soft-interface.c
2009-12-19 09:38:58.000000000 +0100
@@ -121,7 +121,7 @@ void interface_setup(struct net_device *
/* generate random address */
random_ether_addr(dev_addr);
- memcpy(dev->dev_addr, dev_addr, sizeof(dev->dev_addr));
SET_ETHTOOL_OPS(dev, &bat_ethtool_ops);
kmalmem.cocci
*** Use kzalloc instead of kmalloc + memset. Also consider testing the result
of the kmaloc for NULL.
diff -u -p a/originator.c b/originator.c
--- a/originator.c 2009-12-19 09:38:58.000000000 +0100
+++ b/originator.c 2009-12-31 14:56:59.000000000 +0100
@@ -76,8 +76,7 @@ create_neighbor(struct orig_node *orig_n
bat_dbg(DBG_BATMAN, "Creating new last-hop neighbour of originator\n");
- neigh_node = kmalloc(sizeof(struct neigh_node), GFP_ATOMIC);
- memset(neigh_node, 0, sizeof(struct neigh_node));
+ neigh_node = kzalloc(sizeof(struct neigh_node), GFP_ATOMIC);
INIT_LIST_HEAD(&neigh_node->list);
memcpy(neigh_node->addr, neigh, ETH_ALEN);
@@ -126,8 +125,7 @@ struct orig_node *get_orig_node(uint8_t
addr_to_string(orig_str, addr);
bat_dbg(DBG_BATMAN, "Creating new originator: %s \n", orig_str);
- orig_node = kmalloc(sizeof(struct orig_node), GFP_ATOMIC);
- memset(orig_node, 0, sizeof(struct orig_node));
+ orig_node = kzalloc(sizeof(struct orig_node), GFP_ATOMIC);
INIT_LIST_HEAD(&orig_node->neigh_list);
memcpy(orig_node->orig, addr, ETH_ALEN);
@@ -137,12 +135,10 @@ struct orig_node *get_orig_node(uint8_t
size = num_ifs * sizeof(TYPE_OF_WORD) * NUM_WORDS;
- orig_node->bcast_own = kmalloc(size, GFP_ATOMIC);
- memset(orig_node->bcast_own, 0, size);
+ orig_node->bcast_own = kzalloc(size, GFP_ATOMIC);
size = num_ifs * sizeof(uint8_t);
- orig_node->bcast_own_sum = kmalloc(size, GFP_ATOMIC);
- memset(orig_node->bcast_own_sum, 0, size);
+ orig_node->bcast_own_sum = kzalloc(size, GFP_ATOMIC);
hash_add(orig_hash, orig_node);
kmbfree.cocci
*** As far as I can tell, in the following, the if after the out label is not
needed.
diff -u -p /var/linuxes/linux-next/drivers/staging/batman-adv/hard-interface.c
/tmp/nothing
--- /var/linuxes/linux-next/drivers/staging/batman-adv/hard-interface.c
2009-12-19 09:38:58.000000000 +0100
@@ -335,7 +335,7 @@ int hardif_add_interface(char *dev, int
else
batman_if->packet_len = BAT_PACKET_LEN;
- batman_if->packet_buff = kmalloc(batman_if->packet_len, GFP_KERNEL);
if (!batman_if->packet_buff) {
printk(KERN_ERR "batman-adv:Can't add interface packet (%s):
out of memory\n", dev);
@@ -401,7 +401,7 @@ int hardif_add_interface(char *dev, int
out:
if (batman_if->packet_buff)
kfree(batman_if->packet_buff);
- kfree(batman_if);
kfree(dev);
return -1;
}
kmtest.cocci
*** the result of kmalloc should be tested for NULL
diff -u -p /var/linuxes/linux-next/drivers/staging/batman-adv/hash.c
/tmp/nothing
--- /var/linuxes/linux-next/drivers/staging/batman-adv/hash.c 2009-11-23
22:35:21.000000000 +0100
@@ -76,7 +76,7 @@ struct hash_it_t *hash_iterate(struct ha
if (iter_in == NULL) {
iter = kmalloc(sizeof(struct hash_it_t), GFP_ATOMIC);
- iter->index = -1;
iter->bucket = NULL;
iter->prev_bucket = NULL;
} else {
diff -u -p
/var/linuxes/linux-next/drivers/staging/batman-adv/translation-table.c
/tmp/nothing
--- /var/linuxes/linux-next/drivers/staging/batman-adv/translation-table.c
2009-12-19 09:38:58.000000000 +0100
@@ -322,7 +322,6 @@ void hna_global_add_orig(struct orig_nod
if (orig_node->hna_buff_len > 0) {
orig_node->hna_buff = kmalloc(orig_node->hna_buff_len,
GFP_ATOMIC);
- memcpy(orig_node->hna_buff, hna_buff, orig_node->hna_buff_len);
} else {
orig_node->hna_buff = NULL;
}
returns.cocci
*** Perhaps there is no point to put a return by itself at the end of a
function.
diff -u -p a/routing.c b/routing.c
--- a/routing.c 2009-12-19 09:38:58.000000000 +0100
+++ b/routing.c 2009-12-31 14:59:41.000000000 +0100
@@ -307,7 +307,6 @@ static void update_orig(struct orig_node
update_hna:
update_routes(orig_node, orig_node->router, hna_buff, tmp_hna_buff_len);
- return;
}
static char count_real_packets(struct ethhdr *ethhdr,
@@ -627,7 +626,6 @@ static void recv_my_icmp_packet(struct e
}
spin_unlock(&orig_hash_lock);
- return;
}
static void recv_icmp_ttl_exceeded(struct icmp_packet *icmp_packet,
txok.cocci
*** I saw in some patch that functions store in the field .ndo_start_xmit
ought to return NETDEV_TX_OK rather than 0. I haven't submitted any patches
of my own for this situation, so I don't know for sure what the rule is.
diff -u -p a/soft-interface.c b/soft-interface.c
--- a/soft-interface.c 2009-12-19 09:38:58.000000000 +0100
+++ b/soft-interface.c 2009-12-31 15:00:31.000000000 +0100
@@ -263,7 +263,7 @@ dropped:
priv->stats.tx_dropped++;
end:
kfree_skb(skb);
- return 0;
+ return NETDEV_TX_OK;
}
void interface_rx(struct net_device *dev, void *packet, int packet_len)
--------------------------------
----- End forwarded message -----
