This is a note to let you know that I've just added the patch titled
net: fib: fib6_add: fix potential NULL pointer dereference
to the 3.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-fib-fib6_add-fix-potential-null-pointer-dereference.patch
and it can be found in the queue-3.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 5135c9738f9bc5ce5ca34d0e0b6cb11a63e636dd Mon Sep 17 00:00:00 2001
From: Daniel Borkmann <[email protected]>
Date: Sat, 7 Sep 2013 15:13:20 +0200
Subject: net: fib: fib6_add: fix potential NULL pointer dereference
From: Daniel Borkmann <[email protected]>
[ Upstream commit ae7b4e1f213aa659aedf9c6ecad0bf5f0476e1e2 ]
When the kernel is compiled with CONFIG_IPV6_SUBTREES, and we return
with an error in fn = fib6_add_1(), then error codes are encoded into
the return pointer e.g. ERR_PTR(-ENOENT). In such an error case, we
write the error code into err and jump to out, hence enter the if(err)
condition. Now, if CONFIG_IPV6_SUBTREES is enabled, we check for:
if (pn != fn && pn->leaf == rt)
...
if (pn != fn && !pn->leaf && !(pn->fn_flags & RTN_RTINFO))
...
Since pn is NULL and fn is f.e. ERR_PTR(-ENOENT), then pn != fn
evaluates to true and causes a NULL-pointer dereference on further
checks on pn. Fix it, by setting both NULL in error case, so that
pn != fn already evaluates to false and no further dereference
takes place.
This was first correctly implemented in 4a287eba2 ("IPv6 routing,
NLM_F_* flag support: REPLACE and EXCL flags support, warn about
missing CREATE flag"), but the bug got later on introduced by
188c517a0 ("ipv6: return errno pointers consistently for fib6_add_1()").
Signed-off-by: Daniel Borkmann <[email protected]>
Cc: Lin Ming <[email protected]>
Cc: Matti Vaittinen <[email protected]>
Cc: Hannes Frederic Sowa <[email protected]>
Acked-by: Hannes Frederic Sowa <[email protected]>
Acked-by: Matti Vaittinen <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
net/ipv6/ip6_fib.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -825,9 +825,9 @@ int fib6_add(struct fib6_node *root, str
fn = fib6_add_1(root, &rt->rt6i_dst.addr, sizeof(struct in6_addr),
rt->rt6i_dst.plen, offsetof(struct rt6_info, rt6i_dst),
allow_create, replace_required);
-
if (IS_ERR(fn)) {
err = PTR_ERR(fn);
+ fn = NULL;
goto out;
}
Patches currently in stable-queue which might be from [email protected] are
queue-3.11/net-sctp-rfc4443-do-not-report-icmp-redirects-to-user-space.patch
queue-3.11/net-sctp-fix-ipv6-ipsec-encryption-bug-in-sctp_v6_xmit.patch
queue-3.11/net-sctp-fix-bug-in-sctp_poll-for-sock_select_err_queue.patch
queue-3.11/net-fib-fib6_add-fix-potential-null-pointer-dereference.patch
queue-3.11/net-flow_dissector-fix-thoff-for-ipproto_ah.patch
queue-3.11/net-sctp-fix-smatch-warning-in-sctp_send_asconf_del_ip.patch
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