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fix the breakage in close_fd_get_file() calling conventions change 

It used to grab an extra reference to struct file rather than
just transferring to caller the one it had removed from descriptor
table.  New variant doesn't, and callers need to be adjusted.

Reported-and-tested-by: syzbot+47dd250f527cb7bebf24@syzkaller.appspotmail.com
Fixes: 6319194ec5 ("Unify the primitives for file descriptor closing")
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2022-06-05 14:01:42 -04:00
parent 6319194ec5
commit 40a1926022
3 changed files with 4 additions and 6 deletions
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2
drivers/android/binder.c
View File

@ -1857,6 +1857,8 @@ static void binder_deferred_fd_close(int fd)
init_task_work(&twcb->twork, binder_do_fd_close);
twcb->file = close_fd_get_file(fd);
if (twcb->file) {
// pin it until binder_do_fd_close(); see comments there
get_file(twcb->file);
filp_close(twcb->file, current->files);
task_work_add(current, &twcb->twork, TWA_RESUME);
} else {

3
fs/file.c
View File

@ -800,8 +800,7 @@ struct file *__close_fd_get_file(unsigned int fd)
/*
* variant of close_fd that gets a ref on the file for later fput.
* The caller must ensure that filp_close() called on the file, and then
* an fput().
* The caller must ensure that filp_close() called on the file.
*/
struct file *close_fd_get_file(unsigned int fd)
{

5
fs/io_uring.c
View File

@ -5110,7 +5110,7 @@ static int io_close(struct io_kiocb *req, unsigned int issue_flags)
struct files_struct *files = current->files;
struct io_close *close = &req->close;
struct fdtable *fdt;
struct file *file = NULL;
struct file *file;
int ret = -EBADF;
if (req->close.file_slot) {
@ -5127,7 +5127,6 @@ static int io_close(struct io_kiocb *req, unsigned int issue_flags)
file = fdt->fd[close->fd];
if (!file || file->f_op == &io_uring_fops) {
spin_unlock(&files->file_lock);
file = NULL;
goto err;
}
@ -5147,8 +5146,6 @@ static int io_close(struct io_kiocb *req, unsigned int issue_flags)
err:
if (ret < 0)
req_set_fail(req);
if (file)
fput(file);
__io_req_complete(req, issue_flags, ret, 0);
return 0;
}