linux-kernel - [PATCH] net: tls: fix possible info leak in tls_set_device

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Message-Id: <20230223090508.443157-1-hbh25y@gmail.com>
Date:   Thu, 23 Feb 2023 17:05:08 +0800
From:   Hangyu Hua <hbh25y@...il.com>
To:     borisp@...dia.com, john.fastabend@...il.com, kuba@...nel.org,
        davem@...emloft.net, edumazet@...gle.com, pabeni@...hat.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Hangyu Hua <hbh25y@...il.com>
Subject: [PATCH] net: tls: fix possible info leak in tls_set_device_offload()

After tls_set_device_offload() fails, we enter tls_set_sw_offload(). But
tls_set_sw_offload can't set cctx->iv and cctx->rec_seq to NULL if it fails
before kmalloc cctx->iv. This may cause info leak when we call
do_tls_getsockopt_conf().

Fixes: e8f69799810c ("net/tls: Add generic NIC offload infrastructure")
Signed-off-by: Hangyu Hua <hbh25y@...il.com>
---
 net/tls/tls_device.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/tls/tls_device.c b/net/tls/tls_device.c
index 6c593788dc25..a63f6f727f58 100644
--- a/net/tls/tls_device.c
+++ b/net/tls/tls_device.c
@@ -1241,8 +1241,10 @@ int tls_set_device_offload(struct sock *sk, struct tls_context *ctx)
 	kfree(start_marker_record);
 free_rec_seq:
 	kfree(ctx->tx.rec_seq);
+	ctx->tx.rec_seq = NULL;
 free_iv:
 	kfree(ctx->tx.iv);
+	ctx->tx.iv = NULL;
 release_netdev:
 	dev_put(netdev);
 	return rc;
-- 
2.34.1