From 14df015bb1708cd7ba1e5af11a1b0365b165a3ef Mon Sep 17 00:00:00 2001 From: Matti Vaittinen Date: Wed, 16 Nov 2011 21:18:02 +0000 Subject: [PATCH] IPV6 Fix a crash when trying to replace non existing route This patch fixes a crash when non existing IPv6 route is tried to be changed. When new destination node was inserted in middle of FIB6 tree, no relevant sanity checks were performed. Later route insertion might have been prevented due to invalid request, causing node with no rt info being left in tree. When this node was accessed, a crash occurred. Patch adds missing checks in fib6_add_1() Signed-off-by: Matti Vaittinen Signed-off-by: David S. Miller --- net/ipv6/ip6_fib.c | 21 ++++++++++++++------- 1 file changed, 14 insertions(+), 7 deletions(-) diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c index e8a0fcf8850a..e7b26dccd2d3 100644 --- a/net/ipv6/ip6_fib.c +++ b/net/ipv6/ip6_fib.c @@ -449,9 +449,15 @@ static struct fib6_node * fib6_add_1(struct fib6_node *root, void *addr, */ if (plen < fn->fn_bit || !ipv6_prefix_equal(&key->addr, addr, fn->fn_bit)) { - if (!allow_create) + if (!allow_create) { + if (replace_required) { + printk(KERN_WARNING + "IPv6: Can't replace route, no match found\n"); + return ERR_PTR(-ENOENT); + } printk(KERN_WARNING "IPv6: NLM_F_CREATE should be set when creating new route\n"); + } goto insert_above; } @@ -482,7 +488,7 @@ static struct fib6_node * fib6_add_1(struct fib6_node *root, void *addr, fn = dir ? fn->right: fn->left; } while (fn); - if (replace_required && !allow_create) { + if (!allow_create) { /* We should not create new node because * NLM_F_REPLACE was specified without NLM_F_CREATE * I assume it is safe to require NLM_F_CREATE when @@ -492,16 +498,17 @@ static struct fib6_node * fib6_add_1(struct fib6_node *root, void *addr, * MUST be specified if new route is created. * That would keep IPv6 consistent with IPv4 */ - printk(KERN_WARNING - "IPv6: NLM_F_CREATE should be set when creating new route - ignoring request\n"); - return ERR_PTR(-ENOENT); + if (replace_required) { + printk(KERN_WARNING + "IPv6: Can't replace route, no match found\n"); + return ERR_PTR(-ENOENT); + } + printk(KERN_WARNING "IPv6: NLM_F_CREATE should be set when creating new route\n"); } /* * We walked to the bottom of tree. * Create new leaf node without children. */ - if (!allow_create) - printk(KERN_WARNING "IPv6: NLM_F_CREATE should be set when creating new route\n"); ln = node_alloc(); -- 2.30.2