linux-kernel - [PATCH] net: brcm80211: fix potential NULL pointer dereferences

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Message-Id: <20190311073232.30807-1-kjlu@umn.edu>
Date:   Mon, 11 Mar 2019 02:32:30 -0500
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Arend van Spriel <arend.vanspriel@...adcom.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Chi-Hsien Lin <chi-hsien.lin@...ress.com>,
        Wright Feng <wright.feng@...ress.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Rafał Miłecki <rafal@...ecki.pl>,
        Stefan Wahren <stefan.wahren@...e.com>,
        Chung-Hsien Hsu <stanley.hsu@...ress.com>,
        linux-wireless@...r.kernel.org,
        brcm80211-dev-list.pdl@...adcom.com,
        brcm80211-dev-list@...ress.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] net: brcm80211: fix potential NULL pointer dereferences

In case kmemdup fails, the fix returns -ENOMEM to avoid NULL
pointer dereferences.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
index e92f6351bd22..d903a45e7b68 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
@@ -5464,6 +5464,9 @@ static s32 brcmf_get_assoc_ies(struct brcmf_cfg80211_info *cfg,
 		conn_info->req_ie =
 		    kmemdup(cfg->extra_buf, conn_info->req_ie_len,
 			    GFP_KERNEL);
+		if (!conn_info->req_ie)
+			return -ENOMEM;
+
 	} else {
 		conn_info->req_ie_len = 0;
 		conn_info->req_ie = NULL;
@@ -5480,6 +5483,8 @@ static s32 brcmf_get_assoc_ies(struct brcmf_cfg80211_info *cfg,
 		conn_info->resp_ie =
 		    kmemdup(cfg->extra_buf, conn_info->resp_ie_len,
 			    GFP_KERNEL);
+		if (!conn_info->resp_ie)
+			return -ENOMEM;
 	} else {
 		conn_info->resp_ie_len = 0;
 		conn_info->resp_ie = NULL;
-- 
2.17.1