This is a note to let you know that I've just added the patch titled
ipv6: release dst in ping_v6_sendmsg
to the 4.4-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:
ipv6-release-dst-in-ping_v6_sendmsg.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Wed Sep 21 12:45:10 CEST 2016
From: Dave Jones <davej@xxxxxxxxxxxxxxxxx>
Date: Fri, 2 Sep 2016 14:39:50 -0400
Subject: ipv6: release dst in ping_v6_sendmsg
From: Dave Jones <davej@xxxxxxxxxxxxxxxxx>
[ Upstream commit 03c2778a938aaba0893f6d6cdc29511d91a79848 ]
Neither the failure or success paths of ping_v6_sendmsg release
the dst it acquires. This leads to a flood of warnings from
"net/core/dst.c:288 dst_release" on older kernels that
don't have 8bf4ada2e21378816b28205427ee6b0e1ca4c5f1 backported.
That patch optimistically hoped this had been fixed post 3.10, but
it seems at least one case wasn't, where I've seen this triggered
a lot from machines doing unprivileged icmp sockets.
Cc: Martin Lau <kafai@xxxxxx>
Signed-off-by: Dave Jones <davej@xxxxxxxxxxxxxxxxx>
Acked-by: Martin KaFai Lau <kafai@xxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Tested-by: Holger Hoffstätte <holger@xxxxxxxxxxxxxxxxxxxxxx>
---
net/ipv6/ping.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
--- a/net/ipv6/ping.c
+++ b/net/ipv6/ping.c
@@ -150,8 +150,10 @@ int ping_v6_sendmsg(struct sock *sk, str
rt = (struct rt6_info *) dst;
np = inet6_sk(sk);
- if (!np)
- return -EBADF;
+ if (!np) {
+ err = -EBADF;
+ goto dst_err_out;
+ }
if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
fl6.flowi6_oif = np->mcast_oif;
@@ -186,6 +188,9 @@ int ping_v6_sendmsg(struct sock *sk, str
}
release_sock(sk);
+dst_err_out:
+ dst_release(dst);
+
if (err)
return err;
Patches currently in stable-queue which might be from davej@xxxxxxxxxxxxxxxxx are
queue-4.4/ipv6-release-dst-in-ping_v6_sendmsg.patch
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