linux-kernel - [PATCH] airo: fix memory leaks

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Message-Id: <1565927404-4755-1-git-send-email-wenwen@cs.uga.edu>
Date:   Thu, 15 Aug 2019 22:50:02 -0500
From:   Wenwen Wang <wenwen@...uga.edu>
To:     Wenwen Wang <wenwen@...uga.edu>
Cc:     Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Eric Biggers <ebiggers@...gle.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        linux-wireless@...r.kernel.org (open list:NETWORKING DRIVERS (WIRELESS)),
        netdev@...r.kernel.org (open list:NETWORKING DRIVERS),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] airo: fix memory leaks

In proc_BSSList_open(), 'file->private_data' is allocated through kzalloc()
and 'data->rbuffer' is allocated through kmalloc(). In the following
execution, if an error occurs, they are not deallocated, leading to memory
leaks. To fix this issue, free the allocated memory regions before
returning the error.

Signed-off-by: Wenwen Wang <wenwen@...uga.edu>
---
 drivers/net/wireless/cisco/airo.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/cisco/airo.c b/drivers/net/wireless/cisco/airo.c
index 9342ffb..f43c065 100644
--- a/drivers/net/wireless/cisco/airo.c
+++ b/drivers/net/wireless/cisco/airo.c
@@ -5441,11 +5441,18 @@ static int proc_BSSList_open( struct inode *inode, struct file *file ) {
 			Cmd cmd;
 			Resp rsp;
 
-			if (ai->flags & FLAG_RADIO_MASK) return -ENETDOWN;
+			if (ai->flags & FLAG_RADIO_MASK) {
+				kfree(data->rbuffer);
+				kfree(file->private_data);
+				return -ENETDOWN;
+			}
 			memset(&cmd, 0, sizeof(cmd));
 			cmd.cmd=CMD_LISTBSS;
-			if (down_interruptible(&ai->sem))
+			if (down_interruptible(&ai->sem)) {
+				kfree(data->rbuffer);
+				kfree(file->private_data);
 				return -ERESTARTSYS;
+			}
 			issuecommand(ai, &cmd, &rsp);
 			up(&ai->sem);
 			data->readlen = 0;
-- 
2.7.4