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authorReshetova, Elena <elena.reshetova@intel.com>2017-06-30 13:08:05 +0300
committerDavid S. Miller <davem@davemloft.net>2017-07-01 07:39:08 -0700
commit8c9814b97002f61846ebf3048e8df5aae52f7828 (patch)
treecc555b6c6c8542b6ef5ffe213ecb76f55c62630c /net/unix
parentnet: convert netpoll_info.refcnt from atomic_t to refcount_t (diff)
downloadlinux-dev-8c9814b97002f61846ebf3048e8df5aae52f7828.tar.xz
linux-dev-8c9814b97002f61846ebf3048e8df5aae52f7828.zip
net: convert unix_address.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 <elena.reshetova@intel.com> Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com> Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: David Windsor <dwindsor@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/unix')
-rw-r--r--net/unix/af_unix.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index c88525403d2e..b9ee766054f6 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -212,7 +212,7 @@ EXPORT_SYMBOL_GPL(unix_peer_get);
static inline void unix_release_addr(struct unix_address *addr)
{
- if (atomic_dec_and_test(&addr->refcnt))
+ if (refcount_dec_and_test(&addr->refcnt))
kfree(addr);
}
@@ -864,7 +864,7 @@ static int unix_autobind(struct socket *sock)
goto out;
addr->name->sun_family = AF_UNIX;
- atomic_set(&addr->refcnt, 1);
+ refcount_set(&addr->refcnt, 1);
retry:
addr->len = sprintf(addr->name->sun_path+1, "%05x", ordernum) + 1 + sizeof(short);
@@ -1040,7 +1040,7 @@ static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
memcpy(addr->name, sunaddr, addr_len);
addr->len = addr_len;
addr->hash = hash ^ sk->sk_type;
- atomic_set(&addr->refcnt, 1);
+ refcount_set(&addr->refcnt, 1);
if (sun_path[0]) {
addr->hash = UNIX_HASH_SIZE;
@@ -1335,7 +1335,7 @@ restart:
/* copy address information from listening to new sock*/
if (otheru->addr) {
- atomic_inc(&otheru->addr->refcnt);
+ refcount_inc(&otheru->addr->refcnt);
newu->addr = otheru->addr;
}
if (otheru->path.dentry) {