This is a note to let you know that I've just added the patch titled
ax25: add link layer header validation function
to the 4.5-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:
ax25-add-link-layer-header-validation-function.patch
and it can be found in the queue-4.5 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 Sat Apr 16 09:15:18 PDT 2016
From: Willem de Bruijn <willemb@xxxxxxxxxx>
Date: Wed, 9 Mar 2016 21:58:33 -0500
Subject: ax25: add link layer header validation function
From: Willem de Bruijn <willemb@xxxxxxxxxx>
[ Upstream commit ea47781c26510e5d97f80f9aceafe9065bd5e3aa ]
As variable length protocol, AX25 fails link layer header validation
tests based on a minimum length. header_ops.validate allows protocols
to validate headers that are shorter than hard_header_len. Implement
this callback for AX25.
See also http://comments.gmane.org/gmane.linux.network/401064
Signed-off-by: Willem de Bruijn <willemb@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/ax25/ax25_ip.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
--- a/net/ax25/ax25_ip.c
+++ b/net/ax25/ax25_ip.c
@@ -228,8 +228,23 @@ netdev_tx_t ax25_ip_xmit(struct sk_buff
}
#endif
+static bool ax25_validate_header(const char *header, unsigned int len)
+{
+ ax25_digi digi;
+
+ if (!len)
+ return false;
+
+ if (header[0])
+ return true;
+
+ return ax25_addr_parse(header + 1, len - 1, NULL, NULL, &digi, NULL,
+ NULL);
+}
+
const struct header_ops ax25_header_ops = {
.create = ax25_hard_header,
+ .validate = ax25_validate_header,
};
EXPORT_SYMBOL(ax25_header_ops);
Patches currently in stable-queue which might be from willemb@xxxxxxxxxx are
queue-4.5/ax25-add-link-layer-header-validation-function.patch
queue-4.5/net-validate-variable-length-ll-headers.patch
queue-4.5/packet-validate-variable-length-ll-headers.patch
queue-4.5/macvtap-always-pass-ethernet-header-in-linear.patch
queue-4.5/ipv6-udp-fix-udp_mib_ignoredmulti-updates.patch
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