From d25189ca8665e3ed493c7bc0607e62c2fcb314ad Mon Sep 17 00:00:00 2001 From: "Reshetova, Elena" Date: Tue, 4 Jul 2017 15:53:09 +0300 Subject: net, ipx: convert ipx_interface.refcnt 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/ipx/af_ipx.c | 6 +++--- net/ipx/ipx_proc.c | 2 +- 2 files changed, 4 insertions(+), 4 deletions(-) (limited to 'net/ipx') diff --git a/net/ipx/af_ipx.c b/net/ipx/af_ipx.c index fa31ef29e3fa..ac598ec90589 100644 --- a/net/ipx/af_ipx.c +++ b/net/ipx/af_ipx.c @@ -308,7 +308,7 @@ void ipxitf_down(struct ipx_interface *intrfc) static void __ipxitf_put(struct ipx_interface *intrfc) { - if (atomic_dec_and_test(&intrfc->refcnt)) + if (refcount_dec_and_test(&intrfc->refcnt)) __ipxitf_down(intrfc); } @@ -876,7 +876,7 @@ static struct ipx_interface *ipxitf_alloc(struct net_device *dev, __be32 netnum, intrfc->if_ipx_offset = ipx_offset; intrfc->if_sknum = IPX_MIN_EPHEMERAL_SOCKET; INIT_HLIST_HEAD(&intrfc->if_sklist); - atomic_set(&intrfc->refcnt, 1); + refcount_set(&intrfc->refcnt, 1); spin_lock_init(&intrfc->if_sklist_lock); } @@ -1105,7 +1105,7 @@ static struct ipx_interface *ipxitf_auto_create(struct net_device *dev, memcpy((char *)&(intrfc->if_node[IPX_NODE_LEN-dev->addr_len]), dev->dev_addr, dev->addr_len); spin_lock_init(&intrfc->if_sklist_lock); - atomic_set(&intrfc->refcnt, 1); + refcount_set(&intrfc->refcnt, 1); ipxitf_insert(intrfc); dev_hold(dev); } diff --git a/net/ipx/ipx_proc.c b/net/ipx/ipx_proc.c index c1d247ebe916..7d75e4c5c75d 100644 --- a/net/ipx/ipx_proc.c +++ b/net/ipx/ipx_proc.c @@ -53,7 +53,7 @@ static int ipx_seq_interface_show(struct seq_file *seq, void *v) seq_printf(seq, "%-11s", ipx_device_name(i)); seq_printf(seq, "%-9s", ipx_frame_name(i->if_dlink_type)); #ifdef IPX_REFCNT_DEBUG - seq_printf(seq, "%6d", atomic_read(&i->refcnt)); + seq_printf(seq, "%6d", refcount_read(&i->refcnt)); #endif seq_puts(seq, "\n"); out: -- cgit v1.2.3-59-g8ed1b