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xfrm6: Properly handle unsupported protocols

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We don't catch the case if an unsupported protocol is submitted
to the xfrm6 protocol handlers, this can lead to NULL pointer
dereferences. Fix this by adding the appropriate checks.

Fixes: 7e14ea15 ("xfrm6: Add IPsec protocol multiplexer")
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Steffen Klassert 2014-04-29 08:23:03 +02:00
parent 61622cc6f2
commit edb666f07e
1 changed files with 10 additions and 1 deletions
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11
net/ipv6/xfrm6_protocol.c
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@ -50,6 +50,10 @@ int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err)
{
int ret;
struct xfrm6_protocol *handler;
struct xfrm6_protocol __rcu **head = proto_handlers(protocol);
if (!head)
return 0;
for_each_protocol_rcu(*proto_handlers(protocol), handler)
if ((ret = handler->cb_handler(skb, err)) <= 0)
@ -184,10 +188,12 @@ int xfrm6_protocol_register(struct xfrm6_protocol *handler,
struct xfrm6_protocol __rcu **pprev;
struct xfrm6_protocol *t;
bool add_netproto = false;
int ret = -EEXIST;
int priority = handler->priority;
if (!proto_handlers(protocol) || !netproto(protocol))
return -EINVAL;
mutex_lock(&xfrm6_protocol_mutex);
if (!rcu_dereference_protected(*proto_handlers(protocol),
@ -230,6 +236,9 @@ int xfrm6_protocol_deregister(struct xfrm6_protocol *handler,
struct xfrm6_protocol *t;
int ret = -ENOENT;
if (!proto_handlers(protocol) || !netproto(protocol))
return -EINVAL;
mutex_lock(&xfrm6_protocol_mutex);
for (pprev = proto_handlers(protocol);