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Commit f835e471 authored by Robert Olsson's avatar Robert Olsson Committed by David S. Miller
Browse files

[IPV4]: Broken memory allocation in fib_trie 



This should help up the insertion... but the resize is more crucial.
and complex and needs some thinking. 

Signed-off-by: default avatarRobert Olsson <robert.olsson@its.uu.se>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 2f85a429

net/ipv4/fib_trie.c

+39 −17
Original line number Original line Diff line number Diff line
@@ -43,7 +43,7 @@ 
 *		2 of the License, or (at your option) any later version.

 *		2 of the License, or (at your option) any later version.

 */

 */





#define VERSION "0.323"

#define VERSION "0.324"





#include <linux/config.h>

#include <linux/config.h>

#include <asm/uaccess.h>

#include <asm/uaccess.h>
@@ -341,8 +341,10 @@ static struct leaf *leaf_new(void) 
static struct leaf_info *leaf_info_new(int plen)

static struct leaf_info *leaf_info_new(int plen)

{

{

	struct leaf_info *li = kmalloc(sizeof(struct leaf_info),  GFP_KERNEL);

	struct leaf_info *li = kmalloc(sizeof(struct leaf_info),  GFP_KERNEL);

	if(li) {

		li->plen = plen;

		li->plen = plen;

		INIT_LIST_HEAD(&li->falh);

		INIT_LIST_HEAD(&li->falh);

	}

	return li;

	return li;

}

}
@@ -880,7 +882,7 @@ static struct node *trie_rebalance(struct trie *t, struct tnode *tn) 
}

}





static  struct list_head *

static  struct list_head *

fib_insert_node(struct trie *t, u32 key, int plen)

fib_insert_node(struct trie *t, int *err, u32 key, int plen)

{

{

	int pos, newpos;

	int pos, newpos;

	struct tnode *tp = NULL, *tn = NULL;

	struct tnode *tp = NULL, *tn = NULL;
@@ -940,7 +942,6 @@ fib_insert_node(struct trie *t, u32 key, int plen) 
	if(tp && IS_LEAF(tp))

	if(tp && IS_LEAF(tp))

		BUG();

		BUG();





	t->revision++;





	/* Case 1: n is a leaf. Compare prefixes */

	/* Case 1: n is a leaf. Compare prefixes */
@@ -949,8 +950,10 @@ fib_insert_node(struct trie *t, u32 key, int plen) 
		

		

		li = leaf_info_new(plen);

		li = leaf_info_new(plen);

		

		

		if(! li) 

		if(! li) {

			BUG();

			*err = -ENOMEM;

			goto err;

		}





		fa_head = &li->falh;

		fa_head = &li->falh;

		insert_leaf_info(&l->list, li);

		insert_leaf_info(&l->list, li);
@@ -959,14 +962,19 @@ fib_insert_node(struct trie *t, u32 key, int plen) 
	t->size++;

	t->size++;

	l = leaf_new();

	l = leaf_new();





	if(! l) 

	if(! l) {

		BUG();

		*err = -ENOMEM;

		goto err;

	}





	l->key = key;

	l->key = key;

	li = leaf_info_new(plen);

	li = leaf_info_new(plen);





	if(! li) 

	if(! li) {

		BUG();

		tnode_free((struct tnode *) l);

		*err = -ENOMEM;

		goto err;

	}





	fa_head = &li->falh;

	fa_head = &li->falh;

	insert_leaf_info(&l->list, li);

	insert_leaf_info(&l->list, li);
@@ -1003,8 +1011,13 @@ fib_insert_node(struct trie *t, u32 key, int plen) 
			newpos = 0;

			newpos = 0;

			tn = tnode_new(key, newpos, 1); /* First tnode */ 

			tn = tnode_new(key, newpos, 1); /* First tnode */ 

		}

		}

		if(!tn) 



			trie_bug("tnode_pfx_new failed");

		if(!tn) {

			free_leaf_info(li);

			tnode_free((struct tnode *) l);

			*err = -ENOMEM;

			goto err;

		}			

			

			

		NODE_SET_PARENT(tn, tp);

		NODE_SET_PARENT(tn, tp);
@@ -1027,7 +1040,9 @@ fib_insert_node(struct trie *t, u32 key, int plen) 
	}

	}

	/* Rebalance the trie */

	/* Rebalance the trie */

	t->trie = trie_rebalance(t, tp);

	t->trie = trie_rebalance(t, tp);

done:;

done:

	t->revision++;

err:;

	return fa_head;

	return fa_head;

}

}
@@ -1156,8 +1171,12 @@ fn_trie_insert(struct fib_table *tb, struct rtmsg *r, struct kern_rta *rta, 
	 * Insert new entry to the list.

	 * Insert new entry to the list.

	 */

	 */





	if(!fa_head)

	if(!fa_head) {

		fa_head = fib_insert_node(t, key, plen);

		fa_head = fib_insert_node(t, &err, key, plen);

		err = 0;

		if(err) 

			goto out_free_new_fa;

	}





	write_lock_bh(&fib_lock);

	write_lock_bh(&fib_lock);
@@ -1170,6 +1189,9 @@ fn_trie_insert(struct fib_table *tb, struct rtmsg *r, struct kern_rta *rta, 
	rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen, tb->tb_id, nlhdr, req);

	rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen, tb->tb_id, nlhdr, req);

succeeded:

succeeded:

	return 0;

	return 0;



out_free_new_fa:

	kmem_cache_free(fn_alias_kmem, new_fa);

out:

out:

	fib_release_info(fi);

	fib_release_info(fi);

err:;	

err:;