[ 028/133] xfrm_user: return error pointer instead of NULL

From: Greg Kroah-Hartman
Date: Wed Oct 10 2012 - 19:23:47 EST


3.5-stable review patch. If anyone has any objections, please let me know.

------------------


From: Mathias Krause <minipli@xxxxxxxxxxxxxx>

[ Upstream commit 864745d291b5ba80ea0bd0edcbe67273de368836 ]

When dump_one_state() returns an error, e.g. because of a too small
buffer to dump the whole xfrm state, xfrm_state_netlink() returns NULL
instead of an error pointer. But its callers expect an error pointer
and therefore continue to operate on a NULL skbuff.

This could lead to a privilege escalation (execution of user code in
kernel context) if the attacker has CAP_NET_ADMIN and is able to map
address 0.

Signed-off-by: Mathias Krause <minipli@xxxxxxxxxxxxxx>
Acked-by: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/xfrm/xfrm_user.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -872,6 +872,7 @@ static struct sk_buff *xfrm_state_netlin
{
struct xfrm_dump_info info;
struct sk_buff *skb;
+ int err;

skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
if (!skb)
@@ -882,9 +883,10 @@ static struct sk_buff *xfrm_state_netlin
info.nlmsg_seq = seq;
info.nlmsg_flags = 0;

- if (dump_one_state(x, 0, &info)) {
+ err = dump_one_state(x, 0, &info);
+ if (err) {
kfree_skb(skb);
- return NULL;
+ return ERR_PTR(err);
}

return skb;


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