linux-kernel - [PATCH v3] staging: rtlwifi: rtl8822b: fix to avoid NULL pointer dereference

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Message-Id: <20190320170251.31838-1-pakki001@umn.edu>
Date:   Wed, 20 Mar 2019 12:02:49 -0500
From:   Aditya Pakki <pakki001@....edu>
To:     pakki001@....edu
Cc:     kjlu@....edu, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sabin Mihai Rapan <sabin.rapan@...il.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3] staging: rtlwifi: rtl8822b: fix to avoid NULL pointer dereference

skb allocated via dev_alloc_skb can fail and return a NULL pointer.
This patch avoids such a scenario and returns, consistent with other
invocations.

Signed-off-by: Aditya Pakki <pakki001@....edu>

---
v2: Move signed off above the version change log
v1: Patch collision with rtl_phydm.c, fix as per Greg
---
 drivers/staging/rtlwifi/rtl8822be/fw.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/staging/rtlwifi/rtl8822be/fw.c b/drivers/staging/rtlwifi/rtl8822be/fw.c
index f061dd1382aa..cf6b7a80b753 100644
--- a/drivers/staging/rtlwifi/rtl8822be/fw.c
+++ b/drivers/staging/rtlwifi/rtl8822be/fw.c
@@ -743,6 +743,8 @@ void rtl8822be_set_fw_rsvdpagepkt(struct ieee80211_hw *hw, bool b_dl_finished)
 		      u1_rsvd_page_loc, 3);
 
 	skb = dev_alloc_skb(totalpacketlen);
+	if (!skb)
+		return;
 	memcpy((u8 *)skb_put(skb, totalpacketlen), &reserved_page_packet,
 	       totalpacketlen);
 
-- 
2.17.1