payload_length is unsigned, check before subtraction
Signed-off-by: Roel Kluin <roel.kluin@xxxxxxxxx>
---
diff --git a/drivers/staging/wlan-ng/p80211conv.c b/drivers/staging/wlan-ng/p80211conv.c
index 68121b9..9dd8b77 100644
--- a/drivers/staging/wlan-ng/p80211conv.c
+++ b/drivers/staging/wlan-ng/p80211conv.c
@@ -333,11 +333,11 @@ int skb_p80211_to_ether( wlandevice_t *wlandev, UINT32 ethconv, struct sk_buff *
memcpy(saddr, w_hdr->a3.a2, WLAN_ETHADDR_LEN);
} else {
payload_offset = WLAN_HDR_A4_LEN;
- payload_length -= ( WLAN_HDR_A4_LEN - WLAN_HDR_A3_LEN );
- if (payload_length < 0 ) {
+ if (payload_length < WLAN_HDR_A4_LEN - WLAN_HDR_A3_LEN) {
WLAN_LOG_ERROR("A4 frame too short!\n");
return 1;
}
+ payload_length -= (WLAN_HDR_A4_LEN - WLAN_HDR_A3_LEN);
memcpy(daddr, w_hdr->a4.a3, WLAN_ETHADDR_LEN);
memcpy(saddr, w_hdr->a4.a4, WLAN_ETHADDR_LEN);
}
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