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Message-Id: <20170511194134.31183-4-Jason@zx2c4.com> Date: Thu, 11 May 2017 21:41:32 +0200 From: "Jason A. Donenfeld" <Jason@...c4.com> To: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, davem@...emloft.net, kernel-hardening@...ts.openwall.com Cc: "Jason A. Donenfeld" <Jason@...c4.com>, David Howells <dhowells@...hat.com> Subject: [PATCH v8 3/5] rxrpc: check return value of skb_to_sgvec always Signed-off-by: Jason A. Donenfeld <Jason@...c4.com> Cc: David Howells <dhowells@...hat.com> --- net/rxrpc/rxkad.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/net/rxrpc/rxkad.c b/net/rxrpc/rxkad.c index 1bb9b2ccc267..ecab9334e3c1 100644 --- a/net/rxrpc/rxkad.c +++ b/net/rxrpc/rxkad.c @@ -227,7 +227,9 @@ static int rxkad_secure_packet_encrypt(const struct rxrpc_call *call, len &= ~(call->conn->size_align - 1); sg_init_table(sg, nsg); - skb_to_sgvec(skb, sg, 0, len); + err = skb_to_sgvec(skb, sg, 0, len); + if (unlikely(err < 0)) + goto out; skcipher_request_set_crypt(req, sg, sg, len, iv.x); crypto_skcipher_encrypt(req); @@ -342,7 +344,8 @@ static int rxkad_verify_packet_1(struct rxrpc_call *call, struct sk_buff *skb, goto nomem; sg_init_table(sg, nsg); - skb_to_sgvec(skb, sg, offset, 8); + if (unlikely(skb_to_sgvec(skb, sg, offset, 8) < 0)) + goto nomem; /* start the decryption afresh */ memset(&iv, 0, sizeof(iv)); @@ -434,7 +437,11 @@ static int rxkad_verify_packet_2(struct rxrpc_call *call, struct sk_buff *skb, } sg_init_table(sg, nsg); - skb_to_sgvec(skb, sg, offset, len); + if (unlikely(skb_to_sgvec(skb, sg, offset, len) < 0)) { + if (sg != _sg) + kfree(sg); + goto nomem; + } /* decrypt from the session key */ token = call->conn->params.key->payload.data[0]; -- 2.13.0
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