linux-kernel - [PATCH][net-next] rxrpc: fix uninitialized return value in variable err

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Date:   Fri,  9 Aug 2019 18:02:59 +0100
From:   Colin King <colin.king@...onical.com>
To:     David Howells <dhowells@...hat.com>,
        "David S . Miller" <davem@...emloft.net>,
        linux-afs@...ts.infradead.org, netdev@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][net-next] rxrpc: fix uninitialized return value in variable err

From: Colin Ian King <colin.king@...onical.com>

An earlier commit removed the setting of err to -ENOMEM so currently
the skb_shinfo(skb)->nr_frags > 16 check returns with an uninitialized
bogus return code.  Fix this by setting err to -ENOMEM to restore
the original behaviour.

Addresses-Coverity: ("Uninitialized scalar variable")
Fixes: b214b2d8f277 ("rxrpc: Don't use skb_cow_data() in rxkad")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 net/rxrpc/rxkad.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/rxrpc/rxkad.c b/net/rxrpc/rxkad.c
index 8b4cddd8b673..c810a7c43b0f 100644
--- a/net/rxrpc/rxkad.c
+++ b/net/rxrpc/rxkad.c
@@ -248,8 +248,10 @@ static int rxkad_secure_packet_encrypt(const struct rxrpc_call *call,
 	crypto_skcipher_encrypt(req);
 
 	/* we want to encrypt the skbuff in-place */
-	if (skb_shinfo(skb)->nr_frags > 16)
+	if (skb_shinfo(skb)->nr_frags > 16) {
+		err = -ENOMEM;
 		goto out;
+	}
 
 	len = data_size + call->conn->size_align - 1;
 	len &= ~(call->conn->size_align - 1);
-- 
2.20.1