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staging: wfx: fix potential vulnerability to spectre

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array_index_nospec() should be applied after a bound check.

Fixes: 9bca45f3d692 ("staging: wfx: allow to send 802.11 frames")
Reported-by: kbuild test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20191011164746.2518-1-Jerome.Pouiller@silabs.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jérôme Pouiller 2019-10-11 16:47:51 +00:00 committed by Greg Kroah-Hartman
parent 44288f1101
commit 88d0facf18
1 changed files with 2 additions and 0 deletions
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2
drivers/staging/wfx/wfx.h
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@ -13,6 +13,7 @@
#include <linux/completion.h>
#include <linux/workqueue.h>
#include <linux/mutex.h>
#include <linux/nospec.h>
#include <net/mac80211.h>
#include "bh.h"
@ -138,6 +139,7 @@ static inline struct wfx_vif *wdev_to_wvif(struct wfx_dev *wdev, int vif_id)
dev_dbg(wdev->dev, "requesting non-existent vif: %d\n", vif_id);
return NULL;
}
vif_id = array_index_nospec(vif_id, ARRAY_SIZE(wdev->vif));
if (!wdev->vif[vif_id]) {
dev_dbg(wdev->dev, "requesting non-allocated vif: %d\n", vif_id);
return NULL;