From: "Jason A. Donenfeld" Jason@zx2c4.com
commit 89a5ea99662505d2d61f2a3030a6896c2cb3cdb0 upstream.
Signed-off-by: Jason A. Donenfeld Jason@zx2c4.com Acked-by: David Howells dhowells@redhat.com Signed-off-by: David S. Miller davem@davemloft.net [natechancellor: backport to 3.18] Signed-off-by: Nathan Chancellor natechancellor@gmail.com --- net/rxrpc/rxkad.c | 21 +++++++++++++++------ 1 file changed, 15 insertions(+), 6 deletions(-)
diff --git a/net/rxrpc/rxkad.c b/net/rxrpc/rxkad.c index f226709ebd8f..ca5f3662a485 100644 --- a/net/rxrpc/rxkad.c +++ b/net/rxrpc/rxkad.c @@ -209,7 +209,7 @@ static int rxkad_secure_packet_encrypt(const struct rxrpc_call *call, struct sk_buff *trailer; unsigned int len; u16 check; - int nsg; + int nsg, err;
sp = rxrpc_skb(skb);
@@ -240,7 +240,9 @@ 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)) + return err; crypto_blkcipher_encrypt_iv(&desc, sg, sg, len);
_leave(" = 0"); @@ -336,7 +338,7 @@ static int rxkad_verify_packet_auth(const struct rxrpc_call *call, struct sk_buff *trailer; u32 data_size, buf; u16 check; - int nsg; + int nsg, ret;
_enter("");
@@ -348,7 +350,9 @@ static int rxkad_verify_packet_auth(const struct rxrpc_call *call, goto nomem;
sg_init_table(sg, nsg); - skb_to_sgvec(skb, sg, 0, 8); + ret = skb_to_sgvec(skb, sg, 0, 8); + if (unlikely(ret < 0)) + return ret;
/* start the decryption afresh */ memset(&iv, 0, sizeof(iv)); @@ -411,7 +415,7 @@ static int rxkad_verify_packet_encrypt(const struct rxrpc_call *call, struct sk_buff *trailer; u32 data_size, buf; u16 check; - int nsg; + int nsg, ret;
_enter(",{%d}", skb->len);
@@ -430,7 +434,12 @@ static int rxkad_verify_packet_encrypt(const struct rxrpc_call *call, }
sg_init_table(sg, nsg); - skb_to_sgvec(skb, sg, 0, skb->len); + ret = skb_to_sgvec(skb, sg, 0, skb->len); + if (unlikely(ret < 0)) { + if (sg != _sg) + kfree(sg); + return ret; + }
/* decrypt from the session key */ token = call->conn->key->payload.data;