From: Al Viro viro@zeniv.linux.org.uk
mainline inclusion from mainline-v5.14-rc1 commit 185ab886d3fb283e837283c343bf539c371e26cf category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I4OM1C CVE: NA
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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Duplicated logics in all bind variants (autobind, bind-to-path, bind-to-abstract) gets taken into a common helper.
Signed-off-by: Al Viro viro@zeniv.linux.org.uk Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Baisong Zhong zhongbaisong@huawei.com Reviewed-by: Yue Haibing yuehaibing@huawei.com Reviewed-by: Wei Yongjun weiyongjun1@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- net/unix/af_unix.c | 26 +++++++++++++------------- 1 file changed, 13 insertions(+), 13 deletions(-)
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c index b7edca89e0ba..8c5389e4cb2c 100644 --- a/net/unix/af_unix.c +++ b/net/unix/af_unix.c @@ -262,6 +262,14 @@ static void __unix_insert_socket(struct hlist_head *list, struct sock *sk) sk_add_node(sk, list); }
+static void __unix_set_addr(struct sock *sk, struct unix_address *addr, + unsigned hash) +{ + __unix_remove_socket(sk); + smp_store_release(&unix_sk(sk)->addr, addr); + __unix_insert_socket(&unix_socket_table[hash], sk); +} + static inline void unix_remove_socket(struct sock *sk) { spin_lock(&unix_table_lock); @@ -935,9 +943,7 @@ static int unix_autobind(struct socket *sock) } addr->hash ^= sk->sk_type;
- __unix_remove_socket(sk); - smp_store_release(&u->addr, addr); - __unix_insert_socket(&unix_socket_table[addr->hash], sk); + __unix_set_addr(sk, addr, addr->hash); spin_unlock(&unix_table_lock); err = 0;
@@ -1039,7 +1045,6 @@ static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) int err; unsigned int hash; struct unix_address *addr; - struct hlist_head *list; struct path path = { };
err = -EINVAL; @@ -1091,25 +1096,20 @@ static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) hash = d_backing_inode(path.dentry)->i_ino & (UNIX_HASH_SIZE - 1); spin_lock(&unix_table_lock); u->path = path; - list = &unix_socket_table[hash]; } else { spin_lock(&unix_table_lock); err = -EADDRINUSE; if (__unix_find_socket_byname(net, sunaddr, addr_len, sk->sk_type, hash)) { + spin_unlock(&unix_table_lock); unix_release_addr(addr); - goto out_unlock; + goto out_up; } - - list = &unix_socket_table[addr->hash]; + hash = addr->hash; }
err = 0; - __unix_remove_socket(sk); - smp_store_release(&u->addr, addr); - __unix_insert_socket(list, sk); - -out_unlock: + __unix_set_addr(sk, addr, hash); spin_unlock(&unix_table_lock); out_up: mutex_unlock(&u->bindlock);