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sctp: count both sk and asoc sndbuf with skb truesize and sctp_chunk size

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Now it's confusing that asoc sndbuf_used is doing memory accounting with
SCTP_DATA_SNDSIZE(chunk) + sizeof(sk_buff) + sizeof(sctp_chunk) while sk
sk_wmem_alloc is doing that with skb->truesize + sizeof(sctp_chunk).

It also causes sctp_prsctp_prune to count with a wrong freed memory when
sndbuf_policy is not set.

To make this right and also keep consistent between asoc sndbuf_used, sk
sk_wmem_alloc and sk_wmem_queued, use skb->truesize + sizeof(sctp_chunk)
for them.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2018-10-17 03:07:50 +08:00 • committed by David S. Miller
parent 2d0f0ca2c7
commit 605c0ac182
3 changed files with 8 additions and 26 deletions
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21
net/sctp/socket.c
View file

@ -166,12 +166,9 @@ static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
/* Save the chunk pointer in skb for sctp_wfree to use later. */
skb_shinfo(chunk->skb)->destructor_arg = chunk;
asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) +
sizeof(struct sk_buff) +
sizeof(struct sctp_chunk);
refcount_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
sk->sk_wmem_queued += chunk->skb->truesize;
asoc->sndbuf_used += chunk->skb->truesize + sizeof(struct sctp_chunk);
sk->sk_wmem_queued += chunk->skb->truesize + sizeof(struct sctp_chunk);
sk_mem_charge(sk, chunk->skb->truesize);
}
@ -8460,17 +8457,11 @@ static void sctp_wfree(struct sk_buff *skb)
struct sctp_association *asoc = chunk->asoc;
struct sock *sk = asoc->base.sk;
asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) +
sizeof(struct sk_buff) +
sizeof(struct sctp_chunk);
WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc));
/*
* This undoes what is done via sctp_set_owner_w and sk_mem_charge
*/
sk->sk_wmem_queued -= skb->truesize;
sk_mem_uncharge(sk, skb->truesize);
sk->sk_wmem_queued -= skb->truesize + sizeof(struct sctp_chunk);
asoc->sndbuf_used -= skb->truesize + sizeof(struct sctp_chunk);
WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk),
&sk->sk_wmem_alloc));
if (chunk->shkey) {
struct sctp_shared_key *shkey = chunk->shkey;