linux-kernel - [PATCH 13/13] staging:rtl8192u: Remove potential memory leak

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Message-Id: <20180926191704.16322-14-johnfwhitmore@gmail.com>
Date:   Wed, 26 Sep 2018 20:17:04 +0100
From:   John Whitmore <johnfwhitmore@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     devel@...verdev.osuosl.org, gregkh@...uxfoundation.org,
        John Whitmore <johnfwhitmore@...il.com>
Subject: [PATCH 13/13] staging:rtl8192u: Remove potential memory leak

Add call to ieee80211_networks_free() to avoid potential memory
leak if allocation of pHTInfo fails.

If the third allocation fails only the first successful allocation
is freed, not the second.

Signed-off-by: John Whitmore <johnfwhitmore@...il.com>
---
 drivers/staging/rtl8192u/ieee80211/ieee80211_module.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/staging/rtl8192u/ieee80211/ieee80211_module.c b/drivers/staging/rtl8192u/ieee80211/ieee80211_module.c
index 90a097f2cd4e..aada077ced0f 100644
--- a/drivers/staging/rtl8192u/ieee80211/ieee80211_module.c
+++ b/drivers/staging/rtl8192u/ieee80211/ieee80211_module.c
@@ -159,6 +159,11 @@ struct net_device *alloc_ieee80211(int sizeof_priv)
 	ieee->pHTInfo = kzalloc(sizeof(RT_HIGH_THROUGHPUT), GFP_KERNEL);
 	if (ieee->pHTInfo == NULL) {
 		IEEE80211_DEBUG(IEEE80211_DL_ERR, "can't alloc memory for HTInfo\n");
+
+		/* By this point in code ieee80211_networks_allocate() has been
+		 * successfully called so the memory allocated should be freed
+		 */
+		ieee80211_networks_free(ieee);
 		goto failed;
 	}
 	HTUpdateDefaultSetting(ieee);
-- 
2.18.0