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-rw-r--r--fs/fcntl.c20
1 files changed, 11 insertions, 9 deletions
diff --git a/fs/fcntl.c b/fs/fcntl.c
index ce12a6885115..3deec9887089 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -135,18 +135,12 @@ asmlinkage long sys_dup3(unsigned int oldfd, unsigned int newfd, int flags)
if ((flags & ~O_CLOEXEC) != 0)
return -EINVAL;
+ if (unlikely(oldfd == newfd))
+ return -EINVAL;
+
spin_lock(&files->file_lock);
if (!(file = fcheck(oldfd)))
goto out_unlock;
- err = newfd;
- if (unlikely(newfd == oldfd)) {
- if (flags & O_CLOEXEC) {
- fdt = files_fdtable(files);
- FD_SET(newfd, fdt->close_on_exec);
- }
- goto out_unlock;
- }
- err = -EBADF;
if (newfd >= current->signal->rlim[RLIMIT_NOFILE].rlim_cur)
goto out_unlock;
get_file(file); /* We are now finished with oldfd */
@@ -194,6 +188,14 @@ out_fput:
asmlinkage long sys_dup2(unsigned int oldfd, unsigned int newfd)
{
+ if (unlikely(newfd == oldfd)) { /* corner case */
+ struct files_struct *files = current->files;
+ rcu_read_lock();
+ if (!fcheck_files(files, oldfd))
+ oldfd = -EBADF;
+ rcu_read_unlock();
+ return oldfd;
+ }
return sys_dup3(oldfd, newfd, 0);
}