linux-kernel - [PATCH net-next] rxrpc: rxgk: Fix some reference count leaks

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <aAikCbsnnzYtVmIA@stanley.mountain>
Date: Wed, 23 Apr 2025 11:25:45 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: David Howells <dhowells@...hat.com>
Cc: Marc Dionne <marc.dionne@...istor.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>, linux-afs@...ts.infradead.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH net-next] rxrpc: rxgk: Fix some reference count leaks

These paths should call rxgk_put(gk) but they don't.  In the
rxgk_construct_response() function the "goto error;" will free the
"response" skb as well calling rxgk_put() so that's a bonus.

Fixes: 9d1d2b59341f ("rxrpc: rxgk: Implement the yfs-rxgk security class (GSSAPI)")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 net/rxrpc/rxgk.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/net/rxrpc/rxgk.c b/net/rxrpc/rxgk.c
index ba8bc201b8d3..1e19c605bcc8 100644
--- a/net/rxrpc/rxgk.c
+++ b/net/rxrpc/rxgk.c
@@ -440,8 +440,10 @@ static int rxgk_secure_packet(struct rxrpc_call *call, struct rxrpc_txbuf *txb)
 		return PTR_ERR(gk) == -ESTALE ? -EKEYREJECTED : PTR_ERR(gk);
 
 	ret = key_validate(call->conn->key);
-	if (ret < 0)
+	if (ret < 0) {
+		rxgk_put(gk);
 		return ret;
+	}
 
 	call->security_enctype = gk->krb5->etype;
 	txb->cksum = htons(gk->key_number);
@@ -483,7 +485,7 @@ static int rxgk_verify_packet_integrity(struct rxrpc_call *call,
 
 	hdr = kzalloc(sizeof(*hdr), GFP_NOFS);
 	if (!hdr)
-		return -ENOMEM;
+		goto put_gk;
 
 	hdr->epoch	= htonl(call->conn->proto.epoch);
 	hdr->cid	= htonl(call->cid);
@@ -505,6 +507,7 @@ static int rxgk_verify_packet_integrity(struct rxrpc_call *call,
 		sp->len = len;
 	}
 
+put_gk:
 	rxgk_put(gk);
 	_leave(" = %d", ret);
 	return ret;
@@ -594,6 +597,7 @@ static int rxgk_verify_packet(struct rxrpc_call *call, struct sk_buff *skb)
 	call->security_enctype = gk->krb5->etype;
 	switch (call->conn->security_level) {
 	case RXRPC_SECURITY_PLAIN:
+		rxgk_put(gk);
 		return 0;
 	case RXRPC_SECURITY_AUTH:
 		return rxgk_verify_packet_integrity(call, gk, skb);
@@ -969,7 +973,7 @@ static int rxgk_construct_response(struct rxrpc_connection *conn,
 
 	ret = rxgk_pad_out(response, authx_len, authx_offset + authx_len);
 	if (ret < 0)
-		return ret;
+		goto error;
 	len = authx_offset + authx_len + ret;
 
 	if (len != response->len) {
-- 
2.47.2