fs: Allow a NULL pos pointer to __kernel_read (7b84b665) · Commits · 戴 / test

Match the behaviour of new_sync_read() and __kernel_write(). Reviewed-by:

fs/read_write.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -449,10 +449,11 @@ ssize_t __kernel_read(struct file file, void buf, size_t count, loff_t *pos)
		return warn_unsupported(file, "read");

		init_sync_kiocb(&kiocb, file);
		kiocb.ki_pos = *pos;
		kiocb.ki_pos = pos ? *pos : 0;
		iov_iter_kvec(&iter, READ, &iov, 1, iov.iov_len);
		ret = file->f_op->read_iter(&kiocb, &iter);
		if (ret > 0) {
		if (pos)
		*pos = kiocb.ki_pos;
		fsnotify_access(file);
		add_rchar(current, ret);