linux-kernel - [PATCH 5.4 184/434] staging: wilc1000: potential corruption in wilc_parse_join_bss

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Date:   Sun, 29 Dec 2019 18:23:57 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Adham Abozaeid <adham.abozaeid@...rochip.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 184/434] staging: wilc1000: potential corruption in wilc_parse_join_bss_param()

From: Dan Carpenter <dan.carpenter@...cle.com>

[ Upstream commit d59dc92f1bccd5acde793aebdbb4f7121cf3f9af ]

The "rates_len" value needs to be capped so that the memcpy() doesn't
copy beyond the end of the array.

Fixes: c5c77ba18ea6 ("staging: wilc1000: Add SDIO/SPI 802.11 driver")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Reviewed-by: Adham Abozaeid <adham.abozaeid@...rochip.com>
Link: https://lore.kernel.org/r/20191017091832.GB31278@mwanda
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/staging/wilc1000/wilc_hif.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/staging/wilc1000/wilc_hif.c b/drivers/staging/wilc1000/wilc_hif.c
index d3d9ea284816..77d0732f451b 100644
--- a/drivers/staging/wilc1000/wilc_hif.c
+++ b/drivers/staging/wilc1000/wilc_hif.c
@@ -473,6 +473,8 @@ void *wilc_parse_join_bss_param(struct cfg80211_bss *bss,
 	rates_ie = cfg80211_find_ie(WLAN_EID_SUPP_RATES, ies->data, ies->len);
 	if (rates_ie) {
 		rates_len = rates_ie[1];
+		if (rates_len > WILC_MAX_RATES_SUPPORTED)
+			rates_len = WILC_MAX_RATES_SUPPORTED;
 		param->supp_rates[0] = rates_len;
 		memcpy(&param->supp_rates[1], rates_ie + 2, rates_len);
 	}
-- 
2.20.1