This is a note to let you know that I've just added the patch titled
mei: bus: fix received data size check in NFC fixup
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:
mei-bus-fix-received-data-size-check-in-nfc-fixup.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 582ab27a063a506ccb55fc48afcc325342a2deba Mon Sep 17 00:00:00 2001
From: Alexander Usyskin <alexander.usyskin@xxxxxxxxx>
Date: Mon, 31 Oct 2016 19:02:39 +0200
Subject: mei: bus: fix received data size check in NFC fixup
From: Alexander Usyskin <alexander.usyskin@xxxxxxxxx>
commit 582ab27a063a506ccb55fc48afcc325342a2deba upstream.
NFC version reply size checked against only header size, not against
full message size. That may lead potentially to uninitialized memory access
in version data.
That leads to warnings when version data is accessed:
drivers/misc/mei/bus-fixup.c: warning: '*((void *)&ver+11)' may be used uninitialized in this function [-Wuninitialized]: => 212:2
Reported in
Build regressions/improvements in v4.9-rc3
https://lkml.org/lkml/2016/10/30/57
Fixes: 59fcd7c63abf (mei: nfc: Initial nfc implementation)
Signed-off-by: Alexander Usyskin <alexander.usyskin@xxxxxxxxx>
Signed-off-by: Tomas Winkler <tomas.winkler@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/misc/mei/bus-fixup.c | 2 +-
drivers/nfc/mei_phy.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/misc/mei/bus-fixup.c
+++ b/drivers/misc/mei/bus-fixup.c
@@ -151,7 +151,7 @@ static int mei_nfc_if_version(struct mei
ret = 0;
bytes_recv = __mei_cl_recv(cl, (u8 *)reply, if_version_length);
- if (bytes_recv < 0 || bytes_recv < sizeof(struct mei_nfc_reply)) {
+ if (bytes_recv < if_version_length) {
dev_err(bus->dev, "Could not read IF version\n");
ret = -EIO;
goto err;
--- a/drivers/nfc/mei_phy.c
+++ b/drivers/nfc/mei_phy.c
@@ -133,7 +133,7 @@ static int mei_nfc_if_version(struct nfc
return -ENOMEM;
bytes_recv = mei_cldev_recv(phy->cldev, (u8 *)reply, if_version_length);
- if (bytes_recv < 0 || bytes_recv < sizeof(struct mei_nfc_reply)) {
+ if (bytes_recv < 0 || bytes_recv < if_version_length) {
pr_err("Could not read IF version\n");
r = -EIO;
goto err;
Patches currently in stable-queue which might be from alexander.usyskin@xxxxxxxxx are
queue-4.4/mei-bus-fix-received-data-size-check-in-nfc-fixup.patch
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