linux-kernel - [PATCH 4.9 19/97] dccp: Fix memleak in __feat_register

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Message-Id: <20200122092759.115559082@linuxfoundation.org>
Date:   Wed, 22 Jan 2020 10:28:23 +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, Hulk Robot <hulkci@...wei.com>,
        Mukesh Ojha <mojha@...eaurora.org>,
        YueHaibing <yuehaibing@...wei.com>,
        "David S. Miller" <davem@...emloft.net>,
        Ben Hutchings <ben.hutchings@...ethink.co.uk>
Subject: [PATCH 4.9 19/97] dccp: Fix memleak in __feat_register_sp

From: YueHaibing <yuehaibing@...wei.com>

commit 1d3ff0950e2b40dc861b1739029649d03f591820 upstream.

If dccp_feat_push_change fails, we forget free the mem
which is alloced by kmemdup in dccp_feat_clone_sp_val.

Reported-by: Hulk Robot <hulkci@...wei.com>
Fixes: e8ef967a54f4 ("dccp: Registration routines for changing feature values")
Reviewed-by: Mukesh Ojha <mojha@...eaurora.org>
Signed-off-by: YueHaibing <yuehaibing@...wei.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben.hutchings@...ethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/dccp/feat.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/net/dccp/feat.c
+++ b/net/dccp/feat.c
@@ -738,7 +738,12 @@ static int __feat_register_sp(struct lis
 	if (dccp_feat_clone_sp_val(&fval, sp_val, sp_len))
 		return -ENOMEM;
 
-	return dccp_feat_push_change(fn, feat, is_local, mandatory, &fval);
+	if (dccp_feat_push_change(fn, feat, is_local, mandatory, &fval)) {
+		kfree(fval.sp.vec);
+		return -ENOMEM;
+	}
+
+	return 0;
 }
 
 /**