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Subject[PATCH 4.4 160/190] rxrpc: check return value of skb_to_sgvec always
Date
4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

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 4.4]
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/rxrpc/rxkad.c | 21 +++++++++++++++------
1 file changed, 15 insertions(+), 6 deletions(-)

--- a/net/rxrpc/rxkad.c
+++ b/net/rxrpc/rxkad.c
@@ -209,7 +209,7 @@ static int rxkad_secure_packet_encrypt(c
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(c
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(cons
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(cons
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(c
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(c
}

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[0];

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