From: Alexander Usyskin <[email protected]> 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 [js] the check is in 3.12 only once Fixes: 59fcd7c63abf (mei: nfc: Initial nfc implementation) Signed-off-by: Alexander Usyskin <[email protected]> Signed-off-by: Tomas Winkler <[email protected]> Signed-off-by: Jiri Slaby <[email protected]> Signed-off-by: Willy Tarreau <[email protected]> --- drivers/misc/mei/nfc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/misc/mei/nfc.c b/drivers/misc/mei/nfc.c index 4b7ea3f..1f8f856 100644 --- a/drivers/misc/mei/nfc.c +++ b/drivers/misc/mei/nfc.c @@ -292,7 +292,7 @@ static int mei_nfc_if_version(struct mei_nfc_dev *ndev) return -ENOMEM; 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(&dev->pdev->dev, "Could not read IF version\n"); ret = -EIO; goto err; -- 2.8.0.rc2.1.gbe9624a
