This is a note to let you know that I've just added the patch titled
nfc: Ensure presence of required attributes in the activate_target handler
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:
nfc-ensure-presence-of-required-attributes-in-the-activate_target-handler.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 a0323b979f81ad2deb2c8836eab506534891876a Mon Sep 17 00:00:00 2001
From: Mateusz Jurczyk <mjurczyk@xxxxxxxxxx>
Date: Wed, 24 May 2017 12:42:26 +0200
Subject: nfc: Ensure presence of required attributes in the activate_target handler
From: Mateusz Jurczyk <mjurczyk@xxxxxxxxxx>
commit a0323b979f81ad2deb2c8836eab506534891876a upstream.
Check that the NFC_ATTR_TARGET_INDEX and NFC_ATTR_PROTOCOLS attributes (in
addition to NFC_ATTR_DEVICE_INDEX) are provided by the netlink client
prior to accessing them. This prevents potential unhandled NULL pointer
dereference exceptions which can be triggered by malicious user-mode
programs, if they omit one or both of these attributes.
Signed-off-by: Mateusz Jurczyk <mjurczyk@xxxxxxxxxx>
Acked-by: Kees Cook <keescook@xxxxxxxxxxxx>
Signed-off-by: Samuel Ortiz <sameo@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/nfc/netlink.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c
@@ -873,7 +873,9 @@ static int nfc_genl_activate_target(stru
u32 device_idx, target_idx, protocol;
int rc;
- if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
+ if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
+ !info->attrs[NFC_ATTR_TARGET_INDEX] ||
+ !info->attrs[NFC_ATTR_PROTOCOLS])
return -EINVAL;
device_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
Patches currently in stable-queue which might be from mjurczyk@xxxxxxxxxx are
queue-4.4/nfc-add-sockaddr-length-checks-before-accessing-sa_family-in-bind-handlers.patch
queue-4.4/nfc-ensure-presence-of-required-attributes-in-the-activate_target-handler.patch
queue-4.4/nfc-fix-the-sockaddr-length-sanitization-in-llcp_sock_connect.patch