mei: bus: fix received data size check in NFC fixup

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@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 2 insertions, 2 deletions

diff --git a/drivers/misc/mei/bus-fixup.c b/drivers/misc/mei/bus-fixup.c
index e9e6ea3ab73c..75b9d4ac8b1e 100644
--- a/drivers/misc/mei/bus-fixup.c
+++ b/drivers/misc/mei/bus-fixup.c
@@ -178,7 +178,7 @@ static int mei_nfc_if_version(struct mei_cl *cl,
 
         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;
diff --git a/drivers/nfc/mei_phy.c b/drivers/nfc/mei_phy.c
index 83deda4bb4d6..6f9563a96488 100644
--- a/drivers/nfc/mei_phy.c
+++ b/drivers/nfc/mei_phy.c
@@ -133,7 +133,7 @@ static int mei_nfc_if_version(struct nfc_mei_phy *phy)
                 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;