From 14afee4b6092fde451ee17604e5f5c89da33e71e Mon Sep 17 00:00:00 2001 From: "Reshetova, Elena" Date: Fri, 30 Jun 2017 13:08:00 +0300 Subject: net: convert sock.sk_wmem_alloc from atomic_t to refcount_t refcount_t type and corresponding API should be used instead of atomic_t when the variable is used as a reference counter. This allows to avoid accidental refcounter overflows that might lead to use-after-free situations. Signed-off-by: Elena Reshetova Signed-off-by: Hans Liljestrand Signed-off-by: Kees Cook Signed-off-by: David Windsor Signed-off-by: David S. Miller --- net/atm/br2684.c | 2 +- net/atm/clip.c | 2 +- net/atm/common.c | 10 +++++----- net/atm/lec.c | 4 ++-- net/atm/mpc.c | 4 ++-- net/atm/pppoatm.c | 2 +- net/atm/raw.c | 2 +- net/atm/signaling.c | 2 +- 8 files changed, 14 insertions(+), 14 deletions(-) (limited to 'net/atm') diff --git a/net/atm/br2684.c b/net/atm/br2684.c index fca84e111c89..4e111196f902 100644 --- a/net/atm/br2684.c +++ b/net/atm/br2684.c @@ -252,7 +252,7 @@ static int br2684_xmit_vcc(struct sk_buff *skb, struct net_device *dev, ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc; pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev); - atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc); + refcount_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc); ATM_SKB(skb)->atm_options = atmvcc->atm_options; dev->stats.tx_packets++; dev->stats.tx_bytes += skb->len; diff --git a/net/atm/clip.c b/net/atm/clip.c index 47c36f449df0..f271a7bcf5b2 100644 --- a/net/atm/clip.c +++ b/net/atm/clip.c @@ -381,7 +381,7 @@ static netdev_tx_t clip_start_xmit(struct sk_buff *skb, memcpy(here, llc_oui, sizeof(llc_oui)); ((__be16 *) here)[3] = skb->protocol; } - atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); + refcount_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); ATM_SKB(skb)->atm_options = vcc->atm_options; entry->vccs->last_use = jiffies; pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, vcc, vcc->dev); diff --git a/net/atm/common.c b/net/atm/common.c index f06422f4108d..8a4f99114cd2 100644 --- a/net/atm/common.c +++ b/net/atm/common.c @@ -80,9 +80,9 @@ static void vcc_sock_destruct(struct sock *sk) printk(KERN_DEBUG "%s: rmem leakage (%d bytes) detected.\n", __func__, atomic_read(&sk->sk_rmem_alloc)); - if (atomic_read(&sk->sk_wmem_alloc)) + if (refcount_read(&sk->sk_wmem_alloc)) printk(KERN_DEBUG "%s: wmem leakage (%d bytes) detected.\n", - __func__, atomic_read(&sk->sk_wmem_alloc)); + __func__, refcount_read(&sk->sk_wmem_alloc)); } static void vcc_def_wakeup(struct sock *sk) @@ -101,7 +101,7 @@ static inline int vcc_writable(struct sock *sk) struct atm_vcc *vcc = atm_sk(sk); return (vcc->qos.txtp.max_sdu + - atomic_read(&sk->sk_wmem_alloc)) <= sk->sk_sndbuf; + refcount_read(&sk->sk_wmem_alloc)) <= sk->sk_sndbuf; } static void vcc_write_space(struct sock *sk) @@ -156,7 +156,7 @@ int vcc_create(struct net *net, struct socket *sock, int protocol, int family, i memset(&vcc->local, 0, sizeof(struct sockaddr_atmsvc)); memset(&vcc->remote, 0, sizeof(struct sockaddr_atmsvc)); vcc->qos.txtp.max_sdu = 1 << 16; /* for meta VCs */ - atomic_set(&sk->sk_wmem_alloc, 1); + refcount_set(&sk->sk_wmem_alloc, 1); atomic_set(&sk->sk_rmem_alloc, 0); vcc->push = NULL; vcc->pop = NULL; @@ -630,7 +630,7 @@ int vcc_sendmsg(struct socket *sock, struct msghdr *m, size_t size) goto out; } pr_debug("%d += %d\n", sk_wmem_alloc_get(sk), skb->truesize); - atomic_add(skb->truesize, &sk->sk_wmem_alloc); + refcount_add(skb->truesize, &sk->sk_wmem_alloc); skb->dev = NULL; /* for paths shared with net_device interfaces */ ATM_SKB(skb)->atm_options = vcc->atm_options; diff --git a/net/atm/lec.c b/net/atm/lec.c index 09cfe87f0a44..75545717fa46 100644 --- a/net/atm/lec.c +++ b/net/atm/lec.c @@ -181,7 +181,7 @@ lec_send(struct atm_vcc *vcc, struct sk_buff *skb) ATM_SKB(skb)->vcc = vcc; ATM_SKB(skb)->atm_options = vcc->atm_options; - atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); + refcount_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); if (vcc->send(vcc, skb) < 0) { dev->stats.tx_dropped++; return; @@ -345,7 +345,7 @@ static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb) int i; char *tmp; /* FIXME */ - atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); + WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc)); mesg = (struct atmlec_msg *)skb->data; tmp = skb->data; tmp += sizeof(struct atmlec_msg); diff --git a/net/atm/mpc.c b/net/atm/mpc.c index a190800572bd..680a4b9095a1 100644 --- a/net/atm/mpc.c +++ b/net/atm/mpc.c @@ -555,7 +555,7 @@ static int send_via_shortcut(struct sk_buff *skb, struct mpoa_client *mpc) sizeof(struct llc_snap_hdr)); } - atomic_add(skb->truesize, &sk_atm(entry->shortcut)->sk_wmem_alloc); + refcount_add(skb->truesize, &sk_atm(entry->shortcut)->sk_wmem_alloc); ATM_SKB(skb)->atm_options = entry->shortcut->atm_options; entry->shortcut->send(entry->shortcut, skb); entry->packets_fwded++; @@ -911,7 +911,7 @@ static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb) struct mpoa_client *mpc = find_mpc_by_vcc(vcc); struct k_message *mesg = (struct k_message *)skb->data; - atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); + WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc)); if (mpc == NULL) { pr_info("no mpc found\n"); diff --git a/net/atm/pppoatm.c b/net/atm/pppoatm.c index c4e09846d1de..21d9d341a619 100644 --- a/net/atm/pppoatm.c +++ b/net/atm/pppoatm.c @@ -350,7 +350,7 @@ static int pppoatm_send(struct ppp_channel *chan, struct sk_buff *skb) return 1; } - atomic_add(skb->truesize, &sk_atm(ATM_SKB(skb)->vcc)->sk_wmem_alloc); + refcount_add(skb->truesize, &sk_atm(ATM_SKB(skb)->vcc)->sk_wmem_alloc); ATM_SKB(skb)->atm_options = ATM_SKB(skb)->vcc->atm_options; pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, ATM_SKB(skb)->vcc, ATM_SKB(skb)->vcc->dev); diff --git a/net/atm/raw.c b/net/atm/raw.c index 2e17e97a7a8b..821c0797553d 100644 --- a/net/atm/raw.c +++ b/net/atm/raw.c @@ -35,7 +35,7 @@ static void atm_pop_raw(struct atm_vcc *vcc, struct sk_buff *skb) pr_debug("(%d) %d -= %d\n", vcc->vci, sk_wmem_alloc_get(sk), skb->truesize); - atomic_sub(skb->truesize, &sk->sk_wmem_alloc); + WARN_ON(refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc)); dev_kfree_skb_any(skb); sk->sk_write_space(sk); } diff --git a/net/atm/signaling.c b/net/atm/signaling.c index f640a99e14b8..983c3a21a133 100644 --- a/net/atm/signaling.c +++ b/net/atm/signaling.c @@ -67,7 +67,7 @@ static int sigd_send(struct atm_vcc *vcc, struct sk_buff *skb) struct sock *sk; msg = (struct atmsvc_msg *) skb->data; - atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); + WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc)); vcc = *(struct atm_vcc **) &msg->vcc; pr_debug("%d (0x%lx)\n", (int)msg->type, (unsigned long)vcc); sk = sk_atm(vcc); -- cgit v1.2.3-58-ga151