From: Dan Carpenter Date: Sun, 19 Jul 2015 10:52:17 +0000 (+0300) Subject: Staging: rtl8192u: pointer math bug in ieee80211_rx_DELBA() X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=047db9915ed576e817eb02c1d1cf037c49856b59;p=linux-beck.git Staging: rtl8192u: pointer math bug in ieee80211_rx_DELBA() Smatch complains because "delba" is a pointer to struct rtl_80211_hdr_3addr so the "delba += sizeof(struct rtl_80211_hdr_3addr);" is clearly wrong. We are reading nonsense data from beyond the end of the buffer and could oops if that memory isn't mapped. It turns out the next two statements are also wrong. We should delete the += sizeof() statement and "delba+2" should be "&delba->payload[2]". "pReasonCode" isn't used so I deleted that. With-Fix-From: Mateusz Kulikowski Signed-off-by: Dan Carpenter Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/rtl8192u/ieee80211/rtl819x_BAProc.c b/drivers/staging/rtl8192u/ieee80211/rtl819x_BAProc.c index 9ff8e056ab7f..d4215fd5a856 100644 --- a/drivers/staging/rtl8192u/ieee80211/rtl819x_BAProc.c +++ b/drivers/staging/rtl8192u/ieee80211/rtl819x_BAProc.c @@ -571,7 +571,6 @@ int ieee80211_rx_DELBA(struct ieee80211_device *ieee, struct sk_buff *skb) { struct rtl_80211_hdr_3addr *delba = NULL; PDELBA_PARAM_SET pDelBaParamSet = NULL; - u16 *pReasonCode = NULL; u8 *dst = NULL; if (skb->len < sizeof(struct rtl_80211_hdr_3addr) + 6) { @@ -592,9 +591,7 @@ int ieee80211_rx_DELBA(struct ieee80211_device *ieee, struct sk_buff *skb) IEEE80211_DEBUG_DATA(IEEE80211_DL_DATA|IEEE80211_DL_BA, skb->data, skb->len); delba = (struct rtl_80211_hdr_3addr *)skb->data; dst = (u8 *)(&delba->addr2[0]); - delba += sizeof(struct rtl_80211_hdr_3addr); - pDelBaParamSet = (PDELBA_PARAM_SET)(delba+2); - pReasonCode = (u16 *)(delba+4); + pDelBaParamSet = (PDELBA_PARAM_SET)&delba->payload[2]; if(pDelBaParamSet->field.Initiator == 1) {