@@ -4189,23 +4189,23 @@ int vfs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
}
EXPORT_SYMBOL(vfs_symlink);
-static long do_symlinkat(const char __user *oldname, int newdfd,
- const char __user *newname)
+static long do_symlinkat(struct filename *from, int newdfd,
+ struct filename *to)
{
int error;
- struct filename *from;
struct dentry *dentry;
struct path path;
unsigned int lookup_flags = 0;
- from = getname(oldname);
- if (IS_ERR(from))
- return PTR_ERR(from);
+ if (IS_ERR(from)) {
+ error = PTR_ERR(from);
+ goto out_putboth;
+ }
retry:
- dentry = user_path_create(newdfd, newname, &path, lookup_flags);
+ dentry = __filename_create(newdfd, to, &path, lookup_flags);
error = PTR_ERR(dentry);
if (IS_ERR(dentry))
- goto out_putname;
+ goto out_putfrom;
error = security_path_symlink(&path, dentry, from->name);
if (!error) {
@@ -4220,20 +4220,24 @@ static long do_symlinkat(const char __user *oldname, int newdfd,
lookup_flags |= LOOKUP_REVAL;
goto retry;
}
-out_putname:
- putname(from);
+out_putboth:
+ if (!IS_ERR(to))
+ putname(to);
+out_putfrom:
+ if (!IS_ERR(from))
+ putname(from);
return error;
}
SYSCALL_DEFINE3(symlinkat, const char __user *, oldname,
int, newdfd, const char __user *, newname)
{
- return do_symlinkat(oldname, newdfd, newname);
+ return do_symlinkat(getname(oldname), newdfd, getname(newname));
}
SYSCALL_DEFINE2(symlink, const char __user *, oldname, const char __user *, newname)
{
- return do_symlinkat(oldname, AT_FDCWD, newname);
+ return do_symlinkat(getname(oldname), AT_FDCWD, getname(newname));
}
/**
Pass in the struct filename pointers instead of the user string, for uniformity with the recently converted do_mkdnodat(), do_unlinkat(), do_renameat(), do_mkdirat(). Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christian Brauner <christian.brauner@ubuntu.com> Link: https://lore.kernel.org/io-uring/20210330071700.kpjoyp5zlni7uejm@wittgenstein/ Signed-off-by: Dmitry Kadashev <dkadashev@gmail.com> --- fs/namei.c | 28 ++++++++++++++++------------ 1 file changed, 16 insertions(+), 12 deletions(-)