cfg80211: add wiphy_idx_valid to check for wiphy_idx sanity
This will later be used by others, for now make use of it in
cfg80211_drv_by_wiphy_idx() to return early if an invalid
wiphy_idx has been provided.
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/wireless/core.c b/net/wireless/core.c
index 2b3e786..35d457b 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -42,6 +42,9 @@
{
struct cfg80211_registered_device *result = NULL, *drv;
+ if (!wiphy_idx_valid(wiphy_idx))
+ return NULL;
+
list_for_each_entry(drv, &cfg80211_drv_list, list) {
if (drv->wiphy_idx == wiphy_idx) {
result = drv;
@@ -225,7 +228,7 @@
drv->wiphy_idx = wiphy_counter++;
- if (unlikely(drv->wiphy_idx < 0)) {
+ if (unlikely(!wiphy_idx_valid(drv->wiphy_idx))) {
wiphy_counter--;
mutex_unlock(&cfg80211_drv_mutex);
/* ugh, wrapped! */