[PATCH] ieee80211: Workaround malformed 802.11 frames from AP

Stop processing further but return success when we receive a malformed
packet from the AP. We need this patch to workaround some AP bugs. For
example, the beacon frames from the Orinoco AP1000 contains an IE (value
= 128) with length equals to 8 but the actual frame length is only 7.

Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 10 insertions, 7 deletions

diff --git a/net/ieee80211/ieee80211_rx.c b/net/ieee80211/ieee80211_rx.c
index d60358d702d7..770704183a1b 100644
--- a/net/ieee80211/ieee80211_rx.c
+++ b/net/ieee80211/ieee80211_rx.c
@@ -1078,13 +1078,16 @@ static int ieee80211_parse_info_param(struct ieee80211_info_element
 
         while (length >= sizeof(*info_element)) {
                 if (sizeof(*info_element) + info_element->len > length) {
-                        IEEE80211_DEBUG_MGMT("Info elem: parse failed: "
-                                             "info_element->len + 2 > left : "
-                                             "info_element->len+2=%zd left=%d, id=%d.\n",
-                                             info_element->len +
-                                             sizeof(*info_element),
-                                             length, info_element->id);
-                        return 1;
+                        IEEE80211_ERROR("Info elem: parse failed: "
+                                        "info_element->len + 2 > left : "
+                                        "info_element->len+2=%zd left=%d, id=%d.\n",
+                                        info_element->len +
+                                        sizeof(*info_element),
+                                        length, info_element->id);
+                        /* We stop processing but don't return an error here
+                         * because some misbehaviour APs break this rule. ie.
+                         * Orinoco AP1000. */
+                        break;
                 }
 
                 switch (info_element->id) {