linux-kernel - [PATCH 4.9 03/42] esp6: fix memleak on error path in esp6

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Date:   Tue,  9 Jun 2020 19:44:09 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Zhen Lei <thunder.leizhen@...wei.com>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH 4.9 03/42] esp6: fix memleak on error path in esp6_input

From: Zhen Lei <thunder.leizhen@...wei.com>

commit 7284fdf39a912322ce97de2d30def3c6068a418c upstream.

This ought to be an omission in e6194923237 ("esp: Fix memleaks on error
paths."). The memleak on error path in esp6_input is similar to esp_input
of esp4.

Fixes: e6194923237 ("esp: Fix memleaks on error paths.")
Fixes: 3f29770723f ("ipsec: check return value of skb_to_sgvec always")
Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
Cc: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/ipv6/esp6.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/net/ipv6/esp6.c
+++ b/net/ipv6/esp6.c
@@ -426,8 +426,10 @@ static int esp6_input(struct xfrm_state
 
 	sg_init_table(sg, nfrags);
 	ret = skb_to_sgvec(skb, sg, 0, skb->len);
-	if (unlikely(ret < 0))
+	if (unlikely(ret < 0)) {
+		kfree(tmp);
 		goto out;
+	}
 
 	aead_request_set_crypt(req, sg, sg, elen + ivlen, iv);
 	aead_request_set_ad(req, assoclen);