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authorAl Viro <viro@zeniv.linux.org.uk>2021-06-19 06:50:27 +0300
committerDavid S. Miller <davem@davemloft.net>2021-06-21 22:28:49 +0300
commitc34d4582518ff83a4848c2d33a46be82e2499a5b (patch)
tree816f17e3db1a03d9322da1a9955f9b8752512006 /net/unix
parent185ab886d3fb283e837283c343bf539c371e26cf (diff)
downloadlinux-c34d4582518ff83a4848c2d33a46be82e2499a5b.tar.xz
unix_bind(): allocate addr earlier
makes it easier to massage; we do pay for that by extra work (kmalloc+memcpy+kfree) in some error cases, but those are not on the hot paths anyway. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/unix')
-rw-r--r--net/unix/af_unix.c28
1 files changed, 15 insertions, 13 deletions
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 91447624a364..a984cf3d946d 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -1040,6 +1040,15 @@ static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
if (err < 0)
goto out;
addr_len = err;
+ err = -ENOMEM;
+ addr = kmalloc(sizeof(*addr)+addr_len, GFP_KERNEL);
+ if (!addr)
+ goto out;
+
+ memcpy(addr->name, sunaddr, addr_len);
+ addr->len = addr_len;
+ addr->hash = hash ^ sk->sk_type;
+ refcount_set(&addr->refcnt, 1);
if (sun_path[0]) {
umode_t mode = S_IFSOCK |
@@ -1048,7 +1057,7 @@ static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
if (err) {
if (err == -EEXIST)
err = -EADDRINUSE;
- goto out;
+ goto out_addr;
}
}
@@ -1060,16 +1069,6 @@ static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
if (u->addr)
goto out_up;
- err = -ENOMEM;
- addr = kmalloc(sizeof(*addr)+addr_len, GFP_KERNEL);
- if (!addr)
- goto out_up;
-
- memcpy(addr->name, sunaddr, addr_len);
- addr->len = addr_len;
- addr->hash = hash ^ sk->sk_type;
- refcount_set(&addr->refcnt, 1);
-
if (sun_path[0]) {
addr->hash = UNIX_HASH_SIZE;
hash = d_backing_inode(path.dentry)->i_ino & (UNIX_HASH_SIZE - 1);
@@ -1081,20 +1080,23 @@ static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
if (__unix_find_socket_byname(net, sunaddr, addr_len,
sk->sk_type, hash)) {
spin_unlock(&unix_table_lock);
- unix_release_addr(addr);
goto out_up;
}
hash = addr->hash;
}
- err = 0;
__unix_set_addr(sk, addr, hash);
spin_unlock(&unix_table_lock);
+ addr = NULL;
+ err = 0;
out_up:
mutex_unlock(&u->bindlock);
out_put:
if (err)
path_put(&path);
+out_addr:
+ if (addr)
+ unix_release_addr(addr);
out:
return err;
}